Taskbar+Desktop: Add super+D keyboard shortcut

This shortcut has the same effect as pressing the "Show Desktop" button
in the taskbar. This shortcut already exists in Windows.

Userland/Libraries/LibGUI/ConnectionToWindowManagerServer.cpp

@@ -64,6 +64,12 @@ void ConnectionToWindowManagerServer::super_space_key_pressed(i32 wm_id)
         Core::EventLoop::current().post_event(*window, make<WMSuperSpaceKeyPressedEvent>(wm_id));
 }
 
+void ConnectionToWindowManagerServer::super_d_key_pressed(i32 wm_id)
+{
+    if (auto* window = Window::from_window_id(wm_id))
+        Core::EventLoop::current().post_event(*window, make<WMSuperDKeyPressedEvent>(wm_id));
+}
+
 void ConnectionToWindowManagerServer::super_digit_key_pressed(i32 wm_id, u8 digit)
 {
     if (auto* window = Window::from_window_id(wm_id))

Userland/Libraries/LibGUI/ConnectionToWindowManagerServer.h

@@ -34,6 +34,7 @@ private:
     virtual void applet_area_size_changed(i32, Gfx::IntSize const&) override;
     virtual void super_key_pressed(i32) override;
     virtual void super_space_key_pressed(i32) override;
+    virtual void super_d_key_pressed(i32) override;
     virtual void super_digit_key_pressed(i32, u8) override;
     virtual void workspace_changed(i32, u32, u32) override;
     virtual void keymap_changed(i32, String const&) override;

Userland/Libraries/LibGUI/Event.h

@@ -67,6 +67,7 @@ public:
         WM_AppletAreaSizeChanged,
         WM_SuperKeyPressed,
         WM_SuperSpaceKeyPressed,
+        WM_SuperDKeyPressed,
         WM_SuperDigitKeyPressed,
         WM_WorkspaceChanged,
         WM_KeymapChanged,
@@ -117,6 +118,14 @@ public:
     }
 };
 
+class WMSuperDKeyPressedEvent : public WMEvent {
+public:
+    explicit WMSuperDKeyPressedEvent(int client_id)
+        : WMEvent(Event::Type::WM_SuperDKeyPressed, client_id, 0)
+    {
+    }
+};
+
 class WMSuperDigitKeyPressedEvent : public WMEvent {
 public:
     WMSuperDigitKeyPressedEvent(int client_id, u8 digit)

Userland/Services/Taskbar/TaskbarWindow.cpp

@@ -344,6 +344,10 @@ void TaskbarWindow::wm_event(GUI::WMEvent& event)
             warnln("failed to spawn 'Assistant' when requested via Super+Space");
         break;
     }
+    case GUI::Event::WM_SuperDKeyPressed: {
+        toggle_show_desktop();
+        break;
+    }
     case GUI::Event::WM_SuperDigitKeyPressed: {
         auto& digit_event = static_cast<GUI::WMSuperDigitKeyPressedEvent&>(event);
         auto index = digit_event.digit() != 0 ? digit_event.digit() - 1 : 9;

Userland/Services/WindowServer/WindowManager.cpp

@@ -542,6 +542,17 @@ void WindowManager::tell_wms_super_space_key_pressed()
     });
 }
 
+void WindowManager::tell_wms_super_d_key_pressed()
+{
+    for_each_window_manager([](WMConnectionFromClient& conn) {
+        if (conn.window_id() < 0)
+            return IterationDecision::Continue;
+
+        conn.async_super_d_key_pressed(conn.window_id());
+        return IterationDecision::Continue;
+    });
+}
+
 void WindowManager::tell_wms_super_digit_key_pressed(u8 digit)
 {
     for_each_window_manager([digit](WMConnectionFromClient& conn) {
@@ -1605,6 +1616,11 @@ void WindowManager::process_key_event(KeyEvent& event)
             return;
         }
 
+        if (event.type() == Event::KeyDown && event.key() == Key_D) {
+            tell_wms_super_d_key_pressed();
+            return;
+        }
+
         if (event.type() == Event::KeyDown && event.key() >= Key_0 && event.key() <= Key_9) {
             auto digit = event.key() - Key_0;
             tell_wms_super_digit_key_pressed(digit);

Userland/Services/WindowServer/WindowManager.h

@@ -187,6 +187,7 @@ public:
     void tell_wms_applet_area_size_changed(Gfx::IntSize const&);
     void tell_wms_super_key_pressed();
     void tell_wms_super_space_key_pressed();
+    void tell_wms_super_d_key_pressed();
     void tell_wms_super_digit_key_pressed(u8);
     void tell_wms_current_window_stack_changed();
 

Userland/Services/WindowServer/WindowManagerClient.ipc

@@ -9,6 +9,7 @@ endpoint WindowManagerClient
     applet_area_size_changed(i32 wm_id, Gfx::IntSize size) =|
     super_key_pressed(i32 wm_id) =|
     super_space_key_pressed(i32 wm_id) =|
+    super_d_key_pressed(i32 wm_id) =|
     super_digit_key_pressed(i32 wm_id, u8 digit) =|
     workspace_changed(i32 wm_id, u32 row, u32 column) =|
     keymap_changed(i32 wm_id, [UTF8] String keymap) =|