From 5908873b45ecf6dd43411b7df55701576b8e63a6 Mon Sep 17 00:00:00 2001
From: Andreas Kling <kling@serenityos.org>
Date: Mon, 19 Sep 2022 20:47:10 +0200
Subject: [PATCH] LibGUI: Fire Show/Hide events when adding/removing widget
 from tree

This ensures that widgets always get an initial show event.
---
 Userland/Libraries/LibGUI/Widget.cpp | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/Userland/Libraries/LibGUI/Widget.cpp b/Userland/Libraries/LibGUI/Widget.cpp
index 1966f5a22ba..cc16c057f20 100644
--- a/Userland/Libraries/LibGUI/Widget.cpp
+++ b/Userland/Libraries/LibGUI/Widget.cpp
@@ -219,6 +219,11 @@ void Widget::child_event(Core::ChildEvent& event)
         }
         if (window() && event.child() && is<Widget>(*event.child()))
             window()->did_add_widget({}, verify_cast<Widget>(*event.child()));
+
+        if (event.child() && is<Widget>(*event.child()) && static_cast<Widget const&>(*event.child()).is_visible()) {
+            ShowEvent show_event;
+            event.child()->dispatch_event(show_event);
+        }
     }
     if (event.type() == Event::ChildRemoved) {
         if (layout()) {
@@ -228,6 +233,10 @@ void Widget::child_event(Core::ChildEvent& event)
         }
         if (window() && event.child() && is<Widget>(*event.child()))
             window()->did_remove_widget({}, verify_cast<Widget>(*event.child()));
+        if (event.child() && is<Widget>(*event.child())) {
+            HideEvent hide_event;
+            event.child()->dispatch_event(hide_event);
+        }
         update();
     }
     return Core::Object::child_event(event);