diff --git a/Applications/About/main.cpp b/Applications/About/main.cpp
index ee153c97cad..336ccb6f002 100644
--- a/Applications/About/main.cpp
+++ b/Applications/About/main.cpp
@@ -117,7 +117,7 @@ int main(int argc, char** argv)
     quit_button.set_text("Okay");
     quit_button.set_size_policy(GUI::SizePolicy::Fixed, GUI::SizePolicy::Fixed);
     quit_button.set_preferred_size(100, 20);
-    quit_button.on_click = [] {
+    quit_button.on_click = [](auto) {
         GUI::Application::the().quit(0);
     };
 
diff --git a/Applications/Browser/BookmarksBarWidget.cpp b/Applications/Browser/BookmarksBarWidget.cpp
index bda2edfee45..18352045ad9 100644
--- a/Applications/Browser/BookmarksBarWidget.cpp
+++ b/Applications/Browser/BookmarksBarWidget.cpp
@@ -62,7 +62,7 @@ BookmarksBarWidget::BookmarksBarWidget(const String& bookmarks_file, bool enable
     m_additional->set_text(">");
     m_additional->set_size_policy(GUI::SizePolicy::Fixed, GUI::SizePolicy::Fixed);
     m_additional->set_preferred_size(14, 20);
-    m_additional->on_click = [&] {
+    m_additional->on_click = [this](auto) {
         if (m_additional_menu) {
             m_additional_menu->popup(m_additional->relative_position().translated(relative_position().translated(m_additional->window()->position())));
         }
@@ -123,7 +123,7 @@ void BookmarksBarWidget::did_update_model()
         button.set_preferred_size(font().width(title) + 32, 20);
         button.set_relative_rect(rect);
 
-        button.on_click = [title, url, this] {
+        button.on_click = [title, url, this](auto) {
             if (on_bookmark_click)
                 on_bookmark_click(title, url);
         };
@@ -166,7 +166,7 @@ void BookmarksBarWidget::update_content_size()
             m_additional_menu->add_action(GUI::Action::create(bookmark.text(),
                 Gfx::Bitmap::load_from_file("/res/icons/16x16/filetype-html.png"),
                 [&](auto&) {
-                    bookmark.on_click();
+                    bookmark.on_click(0);
                 }));
         }
     }
diff --git a/Applications/Browser/DownloadWidget.cpp b/Applications/Browser/DownloadWidget.cpp
index a187c68d52e..2aabd5242fd 100644
--- a/Applications/Browser/DownloadWidget.cpp
+++ b/Applications/Browser/DownloadWidget.cpp
@@ -31,9 +31,9 @@
 #include <LibCore/File.h>
 #include <LibCore/StandardPaths.h>
 #include <LibGUI/BoxLayout.h>
-#include <LibGUI/MessageBox.h>
 #include <LibGUI/Button.h>
 #include <LibGUI/Label.h>
+#include <LibGUI/MessageBox.h>
 #include <LibGUI/ProgressBar.h>
 #include <LibGUI/Window.h>
 #include <LibProtocol/Client.h>
@@ -106,7 +106,7 @@ DownloadWidget::DownloadWidget(const URL& url)
     m_cancel_button = button_container.add<GUI::Button>("Cancel");
     m_cancel_button->set_size_policy(GUI::SizePolicy::Fixed, GUI::SizePolicy::Fixed);
     m_cancel_button->set_preferred_size(100, 22);
-    m_cancel_button->on_click = [this] {
+    m_cancel_button->on_click = [this](auto) {
         bool success = m_download->stop();
         ASSERT(success);
         window()->close();
@@ -116,7 +116,7 @@ DownloadWidget::DownloadWidget(const URL& url)
     m_close_button->set_enabled(false);
     m_close_button->set_size_policy(GUI::SizePolicy::Fixed, GUI::SizePolicy::Fixed);
     m_close_button->set_preferred_size(100, 22);
-    m_close_button->on_click = [this] {
+    m_close_button->on_click = [this](auto) {
         window()->close();
     };
 }
diff --git a/Applications/Browser/Tab.cpp b/Applications/Browser/Tab.cpp
index eba8cd31aac..7ca38f404a2 100644
--- a/Applications/Browser/Tab.cpp
+++ b/Applications/Browser/Tab.cpp
@@ -118,7 +118,7 @@ Tab::Tab()
     m_bookmark_button->set_size_policy(GUI::SizePolicy::Fixed, GUI::SizePolicy::Fixed);
     m_bookmark_button->set_preferred_size(22, 22);
 
-    m_bookmark_button->on_click = [this] {
+    m_bookmark_button->on_click = [this](auto) {
         auto url = m_html_widget->main_frame().document()->url().to_string();
         if (BookmarksBarWidget::the().contains_bookmark(url)) {
             BookmarksBarWidget::the().remove_bookmark(url);
diff --git a/Applications/Calculator/CalculatorWidget.cpp b/Applications/Calculator/CalculatorWidget.cpp
index ebed7602a9f..a51251dc48b 100644
--- a/Applications/Calculator/CalculatorWidget.cpp
+++ b/Applications/Calculator/CalculatorWidget.cpp
@@ -85,7 +85,7 @@ CalculatorWidget::CalculatorWidget()
     m_clear_button = add<GUI::Button>();
     m_clear_button->set_foreground_color(Color::NamedColor::Red);
     m_clear_button->set_text("C");
-    m_clear_button->on_click = [this] {
+    m_clear_button->on_click = [this](auto) {
         m_keypad.set_value(0.0);
         m_calculator.clear_operation();
         update_display();
@@ -96,7 +96,7 @@ CalculatorWidget::CalculatorWidget()
     m_clear_error_button = add<GUI::Button>();
     m_clear_error_button->set_foreground_color(Color::NamedColor::Red);
     m_clear_error_button->set_text("CE");
-    m_clear_error_button->on_click = [this] {
+    m_clear_error_button->on_click = [this](auto) {
         m_calculator.clear_error();
         update_display();
     };
@@ -106,7 +106,7 @@ CalculatorWidget::CalculatorWidget()
     m_backspace_button = add<GUI::Button>();
     m_backspace_button->set_foreground_color(Color::NamedColor::Red);
     m_backspace_button->set_text("Backspace");
-    m_backspace_button->on_click = [this] {
+    m_backspace_button->on_click = [this](auto) {
         m_keypad.type_backspace();
         update_display();
     };
@@ -117,7 +117,7 @@ CalculatorWidget::CalculatorWidget()
     m_decimal_point_button->move_to(133, 177);
     m_decimal_point_button->set_foreground_color(Color::NamedColor::Blue);
     m_decimal_point_button->set_text(".");
-    m_decimal_point_button->on_click = [this] {
+    m_decimal_point_button->on_click = [this](auto) {
         m_keypad.type_decimal_point();
         update_display();
     };
@@ -175,7 +175,7 @@ CalculatorWidget::CalculatorWidget()
     m_equals_button->move_to(211, 177);
     m_equals_button->set_foreground_color(Color::NamedColor::Red);
     m_equals_button->set_text("=");
-    m_equals_button->on_click = [this] {
+    m_equals_button->on_click = [this](auto) {
         double argument = m_keypad.value();
         double res = m_calculator.finish_operation(argument);
         m_keypad.set_value(res);
@@ -191,7 +191,7 @@ CalculatorWidget::~CalculatorWidget()
 void CalculatorWidget::add_button(GUI::Button& button, Calculator::Operation operation)
 {
     add_button(button);
-    button.on_click = [this, operation] {
+    button.on_click = [this, operation](auto) {
         double argument = m_keypad.value();
         double res = m_calculator.begin_operation(operation, argument);
         m_keypad.set_value(res);
@@ -203,7 +203,7 @@ void CalculatorWidget::add_button(GUI::Button& button, int digit)
 {
     add_button(button);
     button.set_text(String::number(digit));
-    button.on_click = [this, digit] {
+    button.on_click = [this, digit](auto) {
         m_keypad.type_digit(digit);
         update_display();
     };
diff --git a/Applications/Calendar/AddEventDialog.cpp b/Applications/Calendar/AddEventDialog.cpp
index 50f1080ed70..9d0eabe022b 100644
--- a/Applications/Calendar/AddEventDialog.cpp
+++ b/Applications/Calendar/AddEventDialog.cpp
@@ -107,7 +107,7 @@ AddEventDialog::AddEventDialog(RefPtr<Calendar> calendar, Core::DateTime date_ti
     auto& ok_button = button_container.add<GUI::Button>("OK");
     ok_button.set_size_policy(GUI::SizePolicy::Fixed, GUI::SizePolicy::Fixed);
     ok_button.set_preferred_size(80, 20);
-    ok_button.on_click = [this] {
+    ok_button.on_click = [this](auto) {
         dbg() << "TODO: Add event icon on specific tile";
         done(Dialog::ExecOK);
     };
diff --git a/Applications/Calendar/CalendarWidget.cpp b/Applications/Calendar/CalendarWidget.cpp
index 79486fa8c94..3f127e41404 100644
--- a/Applications/Calendar/CalendarWidget.cpp
+++ b/Applications/Calendar/CalendarWidget.cpp
@@ -64,7 +64,7 @@ CalendarWidget::CalendarWidget()
     m_prev_month_button->set_font(Gfx::Font::default_bold_font());
     m_prev_month_button->set_size_policy(GUI::SizePolicy::Fixed, GUI::SizePolicy::Fixed);
     m_prev_month_button->set_preferred_size(40, 40);
-    m_prev_month_button->on_click = [this] {
+    m_prev_month_button->on_click = [this](auto) {
         int m_target_month = m_calendar->selected_month() - 1;
         int m_target_year = m_calendar->selected_year();
 
@@ -79,7 +79,7 @@ CalendarWidget::CalendarWidget()
     m_next_month_button->set_font(Gfx::Font::default_bold_font());
     m_next_month_button->set_size_policy(GUI::SizePolicy::Fixed, GUI::SizePolicy::Fixed);
     m_next_month_button->set_preferred_size(40, 40);
-    m_next_month_button->on_click = [this] {
+    m_next_month_button->on_click = [this](auto) {
         int m_target_month = m_calendar->selected_month() + 1;
         int m_target_year = m_calendar->selected_year();
 
@@ -100,7 +100,7 @@ CalendarWidget::CalendarWidget()
     m_add_event_button = top_right_container.add<GUI::Button>("Add Event");
     m_add_event_button->set_size_policy(GUI::SizePolicy::Fixed, GUI::SizePolicy::Fixed);
     m_add_event_button->set_preferred_size(100, 25);
-    m_add_event_button->on_click = [this] {
+    m_add_event_button->on_click = [this](auto) {
         show_add_event_window();
     };
 
diff --git a/Applications/DisplaySettings/DisplaySettings.cpp b/Applications/DisplaySettings/DisplaySettings.cpp
index 57144f06ab8..aa38bbc2a82 100644
--- a/Applications/DisplaySettings/DisplaySettings.cpp
+++ b/Applications/DisplaySettings/DisplaySettings.cpp
@@ -146,7 +146,7 @@ void DisplaySettingsWidget::create_frame()
     button.set_button_style(Gfx::ButtonStyle::CoolBar);
     button.set_size_policy(GUI::SizePolicy::Fixed, GUI::SizePolicy::Fixed);
     button.set_preferred_size(22, 22);
-    button.on_click = [this]() {
+    button.on_click = [this](auto) {
         Optional<String> open_path = GUI::FilePicker::get_open_filepath("Select wallpaper from file system.");
 
         if (!open_path.has_value())
@@ -240,7 +240,7 @@ void DisplaySettingsWidget::create_frame()
     ok_button.set_text("OK");
     ok_button.set_size_policy(Orientation::Horizontal, GUI::SizePolicy::Fixed);
     ok_button.set_preferred_size(60, 22);
-    ok_button.on_click = [this] {
+    ok_button.on_click = [this](auto) {
         send_settings_to_window_server();
         GUI::Application::the().quit();
     };
@@ -249,7 +249,7 @@ void DisplaySettingsWidget::create_frame()
     cancel_button.set_text("Cancel");
     cancel_button.set_size_policy(Orientation::Horizontal, GUI::SizePolicy::Fixed);
     cancel_button.set_preferred_size(60, 22);
-    cancel_button.on_click = [] {
+    cancel_button.on_click = [](auto) {
         GUI::Application::the().quit();
     };
 
@@ -257,7 +257,7 @@ void DisplaySettingsWidget::create_frame()
     apply_button.set_text("Apply");
     apply_button.set_size_policy(Orientation::Horizontal, GUI::SizePolicy::Fixed);
     apply_button.set_preferred_size(60, 22);
-    apply_button.on_click = [this] {
+    apply_button.on_click = [this](auto) {
         send_settings_to_window_server();
     };
 }
diff --git a/Applications/FileManager/PropertiesDialog.cpp b/Applications/FileManager/PropertiesDialog.cpp
index 94597b2762f..0813e5fbd01 100644
--- a/Applications/FileManager/PropertiesDialog.cpp
+++ b/Applications/FileManager/PropertiesDialog.cpp
@@ -149,16 +149,16 @@ PropertiesDialog::PropertiesDialog(GUI::FileSystemModel& model, String path, boo
 
     button_widget.layout()->add_spacer();
 
-    make_button("OK", button_widget).on_click = [this] {
+    make_button("OK", button_widget).on_click = [this](auto) {
         if (apply_changes())
             close();
     };
-    make_button("Cancel", button_widget).on_click = [this] {
+    make_button("Cancel", button_widget).on_click = [this](auto) {
         close();
     };
 
     m_apply_button = make_button("Apply", button_widget);
-    m_apply_button->on_click = [this] { apply_changes(); };
+    m_apply_button->on_click = [this](auto) { apply_changes(); };
     m_apply_button->set_enabled(false);
 
     update();
diff --git a/Applications/FontEditor/FontEditor.cpp b/Applications/FontEditor/FontEditor.cpp
index 0cb59fb7b9e..f043b14eb40 100644
--- a/Applications/FontEditor/FontEditor.cpp
+++ b/Applications/FontEditor/FontEditor.cpp
@@ -219,7 +219,7 @@ FontEditorWidget::FontEditorWidget(const String& path, RefPtr<Gfx::Font>&& edite
     save_button.set_size_policy(GUI::SizePolicy::Fixed, GUI::SizePolicy::Fill);
     save_button.set_preferred_size(80, 0);
     save_button.set_text("Save");
-    save_button.on_click = [this] {
+    save_button.on_click = [this](auto) {
         auto ret_val = m_edited_font->write_to_file(m_path);
         if (!ret_val) {
             GUI::MessageBox::show("The font file could not be saved.", "Save failed", GUI::MessageBox::Type::Error, GUI::MessageBox::InputType::OK, window());
@@ -230,7 +230,7 @@ FontEditorWidget::FontEditorWidget(const String& path, RefPtr<Gfx::Font>&& edite
     quit_button.set_size_policy(GUI::SizePolicy::Fixed, GUI::SizePolicy::Fill);
     quit_button.set_preferred_size(80, 0);
     quit_button.set_text("Quit");
-    quit_button.on_click = [this] {
+    quit_button.on_click = [](auto) {
         exit(0);
     };
 
diff --git a/Applications/Piano/SamplerWidget.cpp b/Applications/Piano/SamplerWidget.cpp
index 61b92fd52bf..64817fc32a3 100644
--- a/Applications/Piano/SamplerWidget.cpp
+++ b/Applications/Piano/SamplerWidget.cpp
@@ -107,7 +107,7 @@ SamplerWidget::SamplerWidget(AudioEngine& audio_engine)
     m_open_button->set_preferred_size(24, 24);
     m_open_button->set_focusable(false);
     m_open_button->set_icon(Gfx::Bitmap::load_from_file("/res/icons/16x16/open.png"));
-    m_open_button->on_click = [this] {
+    m_open_button->on_click = [this](auto) {
         Optional<String> open_path = GUI::FilePicker::get_open_filepath();
         if (!open_path.has_value())
             return;
diff --git a/Applications/SoundPlayer/SoundPlayerWidget.cpp b/Applications/SoundPlayer/SoundPlayerWidget.cpp
index 9edf5a533b0..082e5738c37 100644
--- a/Applications/SoundPlayer/SoundPlayerWidget.cpp
+++ b/Applications/SoundPlayer/SoundPlayerWidget.cpp
@@ -81,14 +81,14 @@ SoundPlayerWidget::SoundPlayerWidget(GUI::Window& window, NonnullRefPtr<Audio::C
     m_play = control_widget.add<GUI::Button>();
     m_play->set_icon(*m_pause_icon);
     m_play->set_enabled(false);
-    m_play->on_click = [this] {
+    m_play->on_click = [this](auto) {
         m_play->set_icon(m_manager.toggle_pause() ? *m_play_icon : *m_pause_icon);
     };
 
     m_stop = control_widget.add<GUI::Button>();
     m_stop->set_enabled(false);
     m_stop->set_icon(Gfx::Bitmap::load_from_file("/res/icons/16x16/stop.png"));
-    m_stop->on_click = [this] { m_manager.stop(); };
+    m_stop->on_click = [this](auto) { m_manager.stop(); };
 
     m_status = add<GUI::Label>();
     m_status->set_frame_shape(Gfx::FrameShape::Box);
diff --git a/Applications/Welcome/main.cpp b/Applications/Welcome/main.cpp
index 11febbdee4f..1415b3227c9 100644
--- a/Applications/Welcome/main.cpp
+++ b/Applications/Welcome/main.cpp
@@ -248,7 +248,7 @@ int main(int argc, char** argv)
         if (first)
             menu_option.set_checked(true);
 
-        menu_option.on_click = [content = &content, &stack] {
+        menu_option.on_click = [content = &content, &stack](auto) {
             stack.set_active_widget(content);
             content->invalidate_layout();
         };
diff --git a/Demos/HelloWorld/main.cpp b/Demos/HelloWorld/main.cpp
index 7bbe69a1dc8..79e69349260 100644
--- a/Demos/HelloWorld/main.cpp
+++ b/Demos/HelloWorld/main.cpp
@@ -52,7 +52,7 @@ int main(int argc, char** argv)
     button.set_text("Good-bye");
     button.set_size_policy(GUI::SizePolicy::Fill, GUI::SizePolicy::Fixed);
     button.set_preferred_size(0, 20);
-    button.on_click = [&] {
+    button.on_click = [&](auto) {
         app.quit();
     };
 
diff --git a/Demos/WidgetGallery/main.cpp b/Demos/WidgetGallery/main.cpp
index 58f6ead306a..90f38f39f5a 100644
--- a/Demos/WidgetGallery/main.cpp
+++ b/Demos/WidgetGallery/main.cpp
@@ -220,7 +220,7 @@ int main(int argc, char** argv)
     auto& show_buton = tab_msgbox.add<GUI::Button>("Show");
     show_buton.set_size_policy(GUI::SizePolicy::Fill, GUI::SizePolicy::Fixed);
     show_buton.set_preferred_size(0, 20);
-    show_buton.on_click = [&]() {
+    show_buton.on_click = [&](auto) {
         GUI::MessageBox::show(content_textbox.text(), title_textbox.text(), msg_box_type, msg_box_input_type, window);
     };
 
diff --git a/DevTools/HackStudio/FindInFilesWidget.cpp b/DevTools/HackStudio/FindInFilesWidget.cpp
index d146b6fd210..95a556e3657 100644
--- a/DevTools/HackStudio/FindInFilesWidget.cpp
+++ b/DevTools/HackStudio/FindInFilesWidget.cpp
@@ -153,7 +153,7 @@ FindInFilesWidget::FindInFilesWidget()
         current_editor().set_focus(true);
     };
 
-    m_button->on_click = [this] {
+    m_button->on_click = [this](auto) {
         auto results_model = find_in_files(m_textbox->text());
         m_result_view->set_model(results_model);
     };
diff --git a/DevTools/VisualBuilder/main.cpp b/DevTools/VisualBuilder/main.cpp
index c008dda49b0..3f66df42ee0 100644
--- a/DevTools/VisualBuilder/main.cpp
+++ b/DevTools/VisualBuilder/main.cpp
@@ -112,7 +112,7 @@ RefPtr<GUI::Window> make_toolbox_window()
     label_button.set_button_style(Gfx::ButtonStyle::CoolBar);
     label_button.set_tooltip("GLabel");
     label_button.set_icon(Gfx::Bitmap::load_from_file("/res/icons/vbwidgets/label.png"));
-    label_button.on_click = [] {
+    label_button.on_click = [](auto) {
         if (auto* form = VBForm::current())
             form->insert_widget(VBWidgetType::GLabel);
     };
@@ -121,7 +121,7 @@ RefPtr<GUI::Window> make_toolbox_window()
     button_button.set_button_style(Gfx::ButtonStyle::CoolBar);
     button_button.set_tooltip("GButton");
     button_button.set_icon(Gfx::Bitmap::load_from_file("/res/icons/vbwidgets/button.png"));
-    button_button.on_click = [] {
+    button_button.on_click = [](auto) {
         if (auto* form = VBForm::current())
             form->insert_widget(VBWidgetType::GButton);
     };
@@ -129,7 +129,7 @@ RefPtr<GUI::Window> make_toolbox_window()
     spinbox_button.set_button_style(Gfx::ButtonStyle::CoolBar);
     spinbox_button.set_tooltip("GSpinBox");
     spinbox_button.set_icon(Gfx::Bitmap::load_from_file("/res/icons/vbwidgets/spinbox.png"));
-    spinbox_button.on_click = [] {
+    spinbox_button.on_click = [](auto) {
         if (auto* form = VBForm::current())
             form->insert_widget(VBWidgetType::GSpinBox);
     };
@@ -137,7 +137,7 @@ RefPtr<GUI::Window> make_toolbox_window()
     editor_button.set_button_style(Gfx::ButtonStyle::CoolBar);
     editor_button.set_tooltip("GTextEditor");
     editor_button.set_icon(Gfx::Bitmap::load_from_file("/res/icons/vbwidgets/textbox.png"));
-    editor_button.on_click = [] {
+    editor_button.on_click = [](auto) {
         if (auto* form = VBForm::current())
             form->insert_widget(VBWidgetType::GTextEditor);
     };
@@ -145,7 +145,7 @@ RefPtr<GUI::Window> make_toolbox_window()
     progress_bar_button.set_button_style(Gfx::ButtonStyle::CoolBar);
     progress_bar_button.set_tooltip("GProgressBar");
     progress_bar_button.set_icon(Gfx::Bitmap::load_from_file("/res/icons/vbwidgets/progressbar.png"));
-    progress_bar_button.on_click = [] {
+    progress_bar_button.on_click = [](auto) {
         if (auto* form = VBForm::current())
             form->insert_widget(VBWidgetType::GProgressBar);
     };
@@ -153,7 +153,7 @@ RefPtr<GUI::Window> make_toolbox_window()
     slider_button.set_button_style(Gfx::ButtonStyle::CoolBar);
     slider_button.set_tooltip("GSlider");
     slider_button.set_icon(Gfx::Bitmap::load_from_file("/res/icons/vbwidgets/slider.png"));
-    slider_button.on_click = [] {
+    slider_button.on_click = [](auto) {
         if (auto* form = VBForm::current())
             form->insert_widget(VBWidgetType::GSlider);
     };
@@ -161,7 +161,7 @@ RefPtr<GUI::Window> make_toolbox_window()
     checkbox_button.set_button_style(Gfx::ButtonStyle::CoolBar);
     checkbox_button.set_tooltip("GCheckBox");
     checkbox_button.set_icon(Gfx::Bitmap::load_from_file("/res/icons/vbwidgets/checkbox.png"));
-    checkbox_button.on_click = [] {
+    checkbox_button.on_click = [](auto) {
         if (auto* form = VBForm::current())
             form->insert_widget(VBWidgetType::GCheckBox);
     };
@@ -169,7 +169,7 @@ RefPtr<GUI::Window> make_toolbox_window()
     radiobutton_button.set_button_style(Gfx::ButtonStyle::CoolBar);
     radiobutton_button.set_tooltip("GRadioButton");
     radiobutton_button.set_icon(Gfx::Bitmap::load_from_file("/res/icons/filled-radio-circle.png"));
-    radiobutton_button.on_click = [] {
+    radiobutton_button.on_click = [](auto) {
         if (auto* form = VBForm::current())
             form->insert_widget(VBWidgetType::GRadioButton);
     };
@@ -177,7 +177,7 @@ RefPtr<GUI::Window> make_toolbox_window()
     scrollbar_button.set_button_style(Gfx::ButtonStyle::CoolBar);
     scrollbar_button.set_tooltip("GScrollBar");
     scrollbar_button.set_icon(Gfx::Bitmap::load_from_file("/res/icons/vbwidgets/scrollbar.png"));
-    scrollbar_button.on_click = [] {
+    scrollbar_button.on_click = [](auto) {
         if (auto* form = VBForm::current())
             form->insert_widget(VBWidgetType::GScrollBar);
     };
@@ -185,7 +185,7 @@ RefPtr<GUI::Window> make_toolbox_window()
     groupbox_button.set_button_style(Gfx::ButtonStyle::CoolBar);
     groupbox_button.set_tooltip("GGroupBox");
     groupbox_button.set_icon(Gfx::Bitmap::load_from_file("/res/icons/vbwidgets/groupbox.png"));
-    groupbox_button.on_click = [] {
+    groupbox_button.on_click = [](auto) {
         if (auto* form = VBForm::current())
             form->insert_widget(VBWidgetType::GGroupBox);
     };
diff --git a/Games/Minesweeper/Field.cpp b/Games/Minesweeper/Field.cpp
index fde8517cbf3..c41fd59de92 100644
--- a/Games/Minesweeper/Field.cpp
+++ b/Games/Minesweeper/Field.cpp
@@ -147,7 +147,7 @@ Field::Field(GUI::Label& flag_label, GUI::Label& time_label, GUI::Button& face_b
     set_fill_with_background_color(true);
     reset();
 
-    m_face_button.on_click = [this] { reset(); };
+    m_face_button.on_click = [this](auto) { reset(); };
     set_face(Face::Default);
 
     {
@@ -260,7 +260,7 @@ void Field::reset()
             square.label->set_icon(square.has_mine ? m_mine_bitmap : nullptr);
             if (!square.button) {
                 square.button = add<SquareButton>();
-                square.button->on_click = [this, &square] {
+                square.button->on_click = [this, &square](auto) {
                     on_square_clicked(square);
                 };
                 square.button->on_right_click = [this, &square] {
diff --git a/Libraries/LibGUI/AboutDialog.cpp b/Libraries/LibGUI/AboutDialog.cpp
index f2a3ac4c4dd..c6cf1337ef6 100644
--- a/Libraries/LibGUI/AboutDialog.cpp
+++ b/Libraries/LibGUI/AboutDialog.cpp
@@ -85,7 +85,7 @@ AboutDialog::AboutDialog(const StringView& name, const Gfx::Bitmap* icon, Window
     auto& ok_button = button_container.add<Button>("OK");
     ok_button.set_size_policy(SizePolicy::Fixed, SizePolicy::Fixed);
     ok_button.set_preferred_size(80, 20);
-    ok_button.on_click = [this] {
+    ok_button.on_click = [this](auto) {
         done(Dialog::ExecOK);
     };
 }
diff --git a/Libraries/LibGUI/AbstractButton.cpp b/Libraries/LibGUI/AbstractButton.cpp
index b192fefacc9..2677b9baa98 100644
--- a/Libraries/LibGUI/AbstractButton.cpp
+++ b/Libraries/LibGUI/AbstractButton.cpp
@@ -134,7 +134,7 @@ void AbstractButton::mouseup_event(MouseEvent& event)
         m_being_pressed = false;
         update();
         if (was_being_pressed && !was_auto_repeating)
-            click();
+            click(event.modifiers());
     }
     Widget::mouseup_event(event);
 }
@@ -154,7 +154,7 @@ void AbstractButton::leave_event(Core::Event&)
 void AbstractButton::keydown_event(KeyEvent& event)
 {
     if (event.key() == KeyCode::Key_Return) {
-        click();
+        click(event.modifiers());
         event.accept();
         return;
     }
diff --git a/Libraries/LibGUI/AbstractButton.h b/Libraries/LibGUI/AbstractButton.h
index b896a26a2a8..d925a451e72 100644
--- a/Libraries/LibGUI/AbstractButton.h
+++ b/Libraries/LibGUI/AbstractButton.h
@@ -52,7 +52,7 @@ public:
     bool is_hovered() const { return m_hovered; }
     bool is_being_pressed() const { return m_being_pressed; }
 
-    virtual void click() = 0;
+    virtual void click(unsigned modifiers = 0) = 0;
     virtual bool accepts_focus() const override { return true; }
     virtual bool is_uncheckable() const { return true; }
 
diff --git a/Libraries/LibGUI/Button.cpp b/Libraries/LibGUI/Button.cpp
index ace26362ecd..f662c82de4d 100644
--- a/Libraries/LibGUI/Button.cpp
+++ b/Libraries/LibGUI/Button.cpp
@@ -86,7 +86,7 @@ void Button::paint_event(PaintEvent& event)
     paint_text(painter, text_rect, font, text_alignment());
 }
 
-void Button::click()
+void Button::click(unsigned modifiers)
 {
     if (!is_enabled())
         return;
@@ -96,7 +96,7 @@ void Button::click()
         set_checked(!is_checked());
     }
     if (on_click)
-        on_click();
+        on_click(modifiers);
     if (m_action)
         m_action->activate(this);
 }
diff --git a/Libraries/LibGUI/Button.h b/Libraries/LibGUI/Button.h
index 7ab0d8a9d7c..e28972ca4bd 100644
--- a/Libraries/LibGUI/Button.h
+++ b/Libraries/LibGUI/Button.h
@@ -47,12 +47,12 @@ public:
     void set_text_alignment(Gfx::TextAlignment text_alignment) { m_text_alignment = text_alignment; }
     Gfx::TextAlignment text_alignment() const { return m_text_alignment; }
 
-    Function<void()> on_click;
+    Function<void(unsigned modifiers)> on_click;
 
     void set_button_style(Gfx::ButtonStyle style) { m_button_style = style; }
     Gfx::ButtonStyle button_style() const { return m_button_style; }
 
-    virtual void click() override;
+    virtual void click(unsigned modifiers = 0) override;
 
     void set_action(Action&);
 
diff --git a/Libraries/LibGUI/CheckBox.cpp b/Libraries/LibGUI/CheckBox.cpp
index 4917be86d32..f2cdf408977 100644
--- a/Libraries/LibGUI/CheckBox.cpp
+++ b/Libraries/LibGUI/CheckBox.cpp
@@ -97,7 +97,7 @@ void CheckBox::paint_event(PaintEvent& event)
     paint_text(painter, text_rect, font(), Gfx::TextAlignment::TopLeft);
 }
 
-void CheckBox::click()
+void CheckBox::click(unsigned)
 {
     if (!is_enabled())
         return;
diff --git a/Libraries/LibGUI/CheckBox.h b/Libraries/LibGUI/CheckBox.h
index 23367dfc965..86b21cfe2aa 100644
--- a/Libraries/LibGUI/CheckBox.h
+++ b/Libraries/LibGUI/CheckBox.h
@@ -35,7 +35,7 @@ class CheckBox : public AbstractButton {
 public:
     virtual ~CheckBox() override;
 
-    virtual void click() override;
+    virtual void click(unsigned modifiers = 0) override;
 
 private:
     explicit CheckBox(const StringView& = {});
diff --git a/Libraries/LibGUI/ColorPicker.cpp b/Libraries/LibGUI/ColorPicker.cpp
index c4fbea8c748..b897d9ed93c 100644
--- a/Libraries/LibGUI/ColorPicker.cpp
+++ b/Libraries/LibGUI/ColorPicker.cpp
@@ -49,7 +49,7 @@ public:
     Function<void(const Color)> on_click;
 
 protected:
-    virtual void click() override;
+    virtual void click(unsigned modifiers = 0) override;
     virtual void doubleclick_event(GUI::MouseEvent&) override;
     virtual void paint_event(PaintEvent&) override;
 
@@ -136,7 +136,7 @@ void ColorPicker::build_ui()
     ok_button.set_size_policy(SizePolicy::Fixed, SizePolicy::Fill);
     ok_button.set_preferred_size(80, 0);
     ok_button.set_text("OK");
-    ok_button.on_click = [this] {
+    ok_button.on_click = [this](auto) {
         done(ExecOK);
     };
 
@@ -144,7 +144,7 @@ void ColorPicker::build_ui()
     cancel_button.set_size_policy(SizePolicy::Fixed, SizePolicy::Fill);
     cancel_button.set_preferred_size(80, 0);
     cancel_button.set_text("Cancel");
-    cancel_button.on_click = [this] {
+    cancel_button.on_click = [this](auto) {
         done(ExecCancel);
     };
 }
@@ -368,7 +368,7 @@ void ColorButton::paint_event(PaintEvent& event)
     }
 }
 
-void ColorButton::click()
+void ColorButton::click(unsigned)
 {
     if (on_click)
         on_click(m_color);
diff --git a/Libraries/LibGUI/ComboBox.cpp b/Libraries/LibGUI/ComboBox.cpp
index 160994c8fa5..75a5fb72e6e 100644
--- a/Libraries/LibGUI/ComboBox.cpp
+++ b/Libraries/LibGUI/ComboBox.cpp
@@ -68,7 +68,7 @@ ComboBox::ComboBox()
     m_open_button = add<Button>();
     m_open_button->set_focusable(false);
     m_open_button->set_text("\xc3\xb7");
-    m_open_button->on_click = [this] {
+    m_open_button->on_click = [this](auto) {
         if (m_list_window->is_visible())
             close();
         else
diff --git a/Libraries/LibGUI/FilePicker.cpp b/Libraries/LibGUI/FilePicker.cpp
index 019a47d5906..f01b565aa0b 100644
--- a/Libraries/LibGUI/FilePicker.cpp
+++ b/Libraries/LibGUI/FilePicker.cpp
@@ -216,7 +216,7 @@ FilePicker::FilePicker(Mode mode, const StringView& file_name, const StringView&
     cancel_button.set_size_policy(SizePolicy::Fixed, SizePolicy::Fill);
     cancel_button.set_preferred_size(80, 0);
     cancel_button.set_text("Cancel");
-    cancel_button.on_click = [this] {
+    cancel_button.on_click = [this](auto) {
         done(ExecCancel);
     };
 
@@ -224,7 +224,7 @@ FilePicker::FilePicker(Mode mode, const StringView& file_name, const StringView&
     ok_button.set_size_policy(SizePolicy::Fixed, SizePolicy::Fill);
     ok_button.set_preferred_size(80, 0);
     ok_button.set_text(ok_button_name(m_mode));
-    ok_button.on_click = [this] {
+    ok_button.on_click = [this](auto) {
         on_file_return();
     };
 
diff --git a/Libraries/LibGUI/InputBox.cpp b/Libraries/LibGUI/InputBox.cpp
index 9d6025f4e4c..e8322a68cc9 100644
--- a/Libraries/LibGUI/InputBox.cpp
+++ b/Libraries/LibGUI/InputBox.cpp
@@ -83,7 +83,7 @@ void InputBox::build()
     m_ok_button->set_size_policy(SizePolicy::Fill, SizePolicy::Fixed);
     m_ok_button->set_preferred_size(0, 20);
     m_ok_button->set_text("OK");
-    m_ok_button->on_click = [this] {
+    m_ok_button->on_click = [this](auto) {
         dbgprintf("GUI::InputBox: OK button clicked\n");
         m_text_value = m_text_editor->text();
         done(ExecOK);
@@ -93,7 +93,7 @@ void InputBox::build()
     m_cancel_button->set_size_policy(SizePolicy::Fill, SizePolicy::Fixed);
     m_cancel_button->set_preferred_size(0, 20);
     m_cancel_button->set_text("Cancel");
-    m_cancel_button->on_click = [this] {
+    m_cancel_button->on_click = [this](auto) {
         dbgprintf("GUI::InputBox: Cancel button clicked\n");
         done(ExecCancel);
     };
diff --git a/Libraries/LibGUI/MessageBox.cpp b/Libraries/LibGUI/MessageBox.cpp
index 019b20d0a9b..6ed26e12d2b 100644
--- a/Libraries/LibGUI/MessageBox.cpp
+++ b/Libraries/LibGUI/MessageBox.cpp
@@ -134,7 +134,7 @@ void MessageBox::build()
         button.set_size_policy(SizePolicy::Fixed, SizePolicy::Fill);
         button.set_preferred_size(96, 0);
         button.set_text(label);
-        button.on_click = [this, label, result] {
+        button.on_click = [this, label, result](auto) {
             done(result);
         };
     };
diff --git a/Libraries/LibGUI/RadioButton.cpp b/Libraries/LibGUI/RadioButton.cpp
index ce0ec5127c1..422dadc9d41 100644
--- a/Libraries/LibGUI/RadioButton.cpp
+++ b/Libraries/LibGUI/RadioButton.cpp
@@ -78,7 +78,7 @@ void RadioButton::for_each_in_group(Callback callback)
     });
 }
 
-void RadioButton::click()
+void RadioButton::click(unsigned)
 {
     if (!is_enabled())
         return;
diff --git a/Libraries/LibGUI/RadioButton.h b/Libraries/LibGUI/RadioButton.h
index 77c77ec4261..ec5c7b8400d 100644
--- a/Libraries/LibGUI/RadioButton.h
+++ b/Libraries/LibGUI/RadioButton.h
@@ -35,7 +35,7 @@ class RadioButton : public AbstractButton {
 public:
     virtual ~RadioButton() override;
 
-    virtual void click() override;
+    virtual void click(unsigned modifiers = 0) override;
 
 protected:
     explicit RadioButton(const StringView& text = {});
diff --git a/Libraries/LibGUI/SpinBox.cpp b/Libraries/LibGUI/SpinBox.cpp
index 46bf956cb75..df179ad56bc 100644
--- a/Libraries/LibGUI/SpinBox.cpp
+++ b/Libraries/LibGUI/SpinBox.cpp
@@ -45,12 +45,12 @@ SpinBox::SpinBox()
     m_increment_button = add<Button>();
     m_increment_button->set_focusable(false);
     m_increment_button->set_text("\xc3\xb6");
-    m_increment_button->on_click = [this] { set_value(m_value + 1); };
+    m_increment_button->on_click = [this](auto) { set_value(m_value + 1); };
     m_increment_button->set_auto_repeat_interval(150);
     m_decrement_button = add<Button>();
     m_decrement_button->set_focusable(false);
     m_decrement_button->set_text("\xc3\xb7");
-    m_decrement_button->on_click = [this] { set_value(m_value - 1); };
+    m_decrement_button->on_click = [this](auto) { set_value(m_value - 1); };
     m_decrement_button->set_auto_repeat_interval(150);
 }
 
diff --git a/Libraries/LibWeb/DOM/HTMLInputElement.cpp b/Libraries/LibWeb/DOM/HTMLInputElement.cpp
index f3888e3b5c4..df87b91ddc1 100644
--- a/Libraries/LibWeb/DOM/HTMLInputElement.cpp
+++ b/Libraries/LibWeb/DOM/HTMLInputElement.cpp
@@ -60,7 +60,7 @@ RefPtr<LayoutNode> HTMLInputElement::create_layout_node(const StyleProperties*)
         auto& button = html_view.add<GUI::Button>(value());
         int text_width = Gfx::Font::default_font().width(value());
         button.set_relative_rect(0, 0, text_width + 20, 20);
-        button.on_click = [this] {
+        button.on_click = [this](auto) {
             if (auto* form = first_ancestor_of_type<HTMLFormElement>()) {
                 // FIXME: Remove this const_cast once we have a non-const first_ancestor_of_type.
                 const_cast<HTMLFormElement*>(form)->submit(this);
diff --git a/Services/SystemMenu/PowerDialog.cpp b/Services/SystemMenu/PowerDialog.cpp
index f1416a73fcd..0aa7f5a14b6 100644
--- a/Services/SystemMenu/PowerDialog.cpp
+++ b/Services/SystemMenu/PowerDialog.cpp
@@ -102,13 +102,13 @@ PowerDialog::PowerDialog()
     button_box.layout()->set_spacing(8);
 
     auto& ok_button = button_box.add<GUI::Button>();
-    ok_button.on_click = [this] {
+    ok_button.on_click = [this](auto) {
         done(ExecResult::ExecOK);
     };
     ok_button.set_text("OK");
 
     auto& cancel_button = button_box.add<GUI::Button>();
-    cancel_button.on_click = [this] {
+    cancel_button.on_click = [this](auto) {
         done(ExecResult::ExecCancel);
     };
     cancel_button.set_text("Cancel");
diff --git a/Services/Taskbar/TaskbarWindow.cpp b/Services/Taskbar/TaskbarWindow.cpp
index 92b49f79142..d287583cd78 100644
--- a/Services/Taskbar/TaskbarWindow.cpp
+++ b/Services/Taskbar/TaskbarWindow.cpp
@@ -116,7 +116,7 @@ void TaskbarWindow::create_quick_launch_bar()
 
         button.set_icon(Gfx::Bitmap::load_from_file(app_icon_path));
         button.set_tooltip(name);
-        button.on_click = [app_executable] {
+        button.on_click = [app_executable](auto) {
             pid_t pid = fork();
             if (pid < 0) {
                 perror("fork");
diff --git a/Services/Taskbar/WindowList.cpp b/Services/Taskbar/WindowList.cpp
index 948dcb04528..1a60990286e 100644
--- a/Services/Taskbar/WindowList.cpp
+++ b/Services/Taskbar/WindowList.cpp
@@ -50,7 +50,7 @@ Window& WindowList::ensure_window(const WindowIdentifier& identifier)
         return *it->value;
     auto window = make<Window>(identifier);
     window->set_button(aid_create_button(identifier));
-    window->button()->on_click = [window = window.ptr(), identifier] {
+    window->button()->on_click = [window = window.ptr(), identifier](auto) {
         if (window->is_minimized() || !window->is_active()) {
             GUI::WindowServerConnection::the().post_message(Messages::WindowServer::WM_SetActiveWindow(identifier.client_id(), identifier.window_id()));
         } else {