Clear up info/menus and eventual prompts when reseting to normal mode

Fixes #697

src/client.cc

@@ -287,7 +287,7 @@ void Client::close_buffer_reload_dialog()
 {
     kak_assert(m_buffer_reload_dialog_opened);
     m_buffer_reload_dialog_opened = false;
-    m_ui->info_hide();
+    info_hide();
     m_input_handler.reset_normal_mode();
 }
 

src/context.cc

@@ -150,9 +150,14 @@ void Context::change_buffer(Buffer& buffer)
 
     m_window.reset();
     if (has_client())
+    {
         client().change_buffer(buffer);
+        client().info_hide();
+        client().menu_hide();
+    }
     else
         m_selections = SelectionList{buffer, Selection{}};
+
     if (has_input_handler())
         input_handler().reset_normal_mode();
 }

src/input_handler.cc

@@ -883,6 +883,7 @@ private:
     }
 
     void on_enabled() override { display(); }
+    void on_disabled() override { context().print_status({}); }
 
     PromptCallback m_callback;
     Completer      m_completer;