LibGUI+WindowServer: Add new WMEvent Super+Digit

This adds a keyboard event for Super+0 to Super+9. Later to be consumed
in the taskbar.

Currently only this keyboard sequence is supported:
  - Super key down
  - Digit key down

But not this:
  - Super key down
  - Digit key down
  - Digit key up
  - Digit key down

Userland/Libraries/LibGUI/Event.h

@@ -66,6 +66,7 @@ public:
         WM_AppletAreaSizeChanged,
         WM_SuperKeyPressed,
         WM_SuperSpaceKeyPressed,
+        WM_SuperDigitKeyPressed,
         WM_WorkspaceChanged,
         WM_KeymapChanged,
         __End_WM_Events,
@@ -115,6 +116,20 @@ public:
     }
 };
 
+class WMSuperDigitKeyPressedEvent : public WMEvent {
+public:
+    WMSuperDigitKeyPressedEvent(int client_id, u8 digit)
+        : WMEvent(Event::Type::WM_SuperDigitKeyPressed, client_id, 0)
+        , m_digit(digit)
+    {
+    }
+
+    u8 digit() const { return m_digit; }
+
+private:
+    u8 m_digit { 0 };
+};
+
 class WMAppletAreaSizeChangedEvent : public WMEvent {
 public:
     explicit WMAppletAreaSizeChangedEvent(const Gfx::IntSize& size)

Userland/Libraries/LibGUI/WindowManagerServerConnection.cpp

@@ -64,6 +64,12 @@ void WindowManagerServerConnection::super_space_key_pressed(i32 wm_id)
         Core::EventLoop::current().post_event(*window, make<WMSuperSpaceKeyPressedEvent>(wm_id));
 }
 
+void WindowManagerServerConnection::super_digit_key_pressed(i32 wm_id, u8 digit)
+{
+    if (auto* window = Window::from_window_id(wm_id))
+        Core::EventLoop::current().post_event(*window, make<WMSuperDigitKeyPressedEvent>(wm_id, digit));
+}
+
 void WindowManagerServerConnection::workspace_changed(i32 wm_id, u32 row, u32 column)
 {
     if (auto* window = Window::from_window_id(wm_id))

Userland/Libraries/LibGUI/WindowManagerServerConnection.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_digit_key_pressed(i32, u8) override;
     virtual void workspace_changed(i32, u32, u32) override;
     virtual void keymap_changed(i32, String const&) override;
 };

Userland/Services/WindowServer/WindowManager.cpp

@@ -546,6 +546,17 @@ void WindowManager::tell_wms_super_space_key_pressed()
     });
 }
 
+void WindowManager::tell_wms_super_digit_key_pressed(u8 digit)
+{
+    for_each_window_manager([digit](WMClientConnection& conn) {
+        if (conn.window_id() < 0)
+            return IterationDecision::Continue;
+
+        conn.async_super_digit_key_pressed(conn.window_id(), digit);
+        return IterationDecision::Continue;
+    });
+}
+
 void WindowManager::tell_wms_current_window_stack_changed()
 {
     for_each_window_manager([&](WMClientConnection& conn) {
@@ -1603,6 +1614,12 @@ void WindowManager::process_key_event(KeyEvent& event)
             tell_wms_super_space_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);
+            return;
+        }
     }
 
     if (MenuManager::the().current_menu() && event.key() != Key_Super) {

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_digit_key_pressed(u8);
     void tell_wms_current_window_stack_changed();
 
     bool is_active_window_or_accessory(Window&) const;

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_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) =|
 }