WindowServer: Make most remaining WindowServer IPC calls async

The only remaining sync call from client to server is now the call
that switches a window's backing store. That one actually relies on
the synchronization to hand over ownership of the backing stores,
so it has to stay synchronous for now.

Userland/Applications/Magnifier/MagnifierWidget.cpp

@@ -27,7 +27,7 @@ void MagnifierWidget::track_cursor_globally()
     VERIFY(window_id >= 0);
 
     set_global_cursor_tracking(true);
-    GUI::WindowServerConnection::the().set_global_cursor_tracking(window_id, true);
+    GUI::WindowServerConnection::the().async_set_global_cursor_tracking(window_id, true);
 }
 
 void MagnifierWidget::set_scale_factor(int scale_factor)

Userland/Applications/MouseSettings/MouseSettingsWindow.cpp

@@ -24,9 +24,9 @@ constexpr int double_click_speed_default = 250;
 void MouseSettingsWindow::update_window_server()
 {
     const float factor = m_speed_slider->value() / speed_slider_scale;
-    GUI::WindowServerConnection::the().set_mouse_acceleration(factor);
-    GUI::WindowServerConnection::the().set_scroll_step_size(m_scroll_length_spinbox->value());
-    GUI::WindowServerConnection::the().set_double_click_speed(m_double_click_speed_slider->value());
+    GUI::WindowServerConnection::the().async_set_mouse_acceleration(factor);
+    GUI::WindowServerConnection::the().async_set_scroll_step_size(m_scroll_length_spinbox->value());
+    GUI::WindowServerConnection::the().async_set_double_click_speed(m_double_click_speed_slider->value());
 }
 
 void MouseSettingsWindow::reset_default_values()

Userland/Demos/CatDog/CatDog.cpp

@@ -135,7 +135,7 @@ void CatDog::track_cursor_globally()
     VERIFY(window_id >= 0);
 
     set_global_cursor_tracking(true);
-    GUI::WindowServerConnection::the().set_global_cursor_tracking(window_id, true);
+    GUI::WindowServerConnection::the().async_set_global_cursor_tracking(window_id, true);
 }
 
 void CatDog::context_menu_event(GUI::ContextMenuEvent& event)

Userland/Demos/Eyes/EyesWidget.cpp

@@ -22,7 +22,7 @@ void EyesWidget::track_cursor_globally()
     VERIFY(window_id >= 0);
 
     set_global_cursor_tracking(true);
-    GUI::WindowServerConnection::the().set_global_cursor_tracking(window_id, true);
+    GUI::WindowServerConnection::the().async_set_global_cursor_tracking(window_id, true);
 }
 
 void EyesWidget::mousemove_event(GUI::MouseEvent& event)

Userland/Libraries/LibGUI/Window.cpp

@@ -911,7 +911,7 @@ void Window::set_fullscreen(bool fullscreen)
     m_fullscreen = fullscreen;
     if (!is_visible())
         return;
-    WindowServerConnection::the().set_fullscreen(m_window_id, fullscreen);
+    WindowServerConnection::the().async_set_fullscreen(m_window_id, fullscreen);
 }
 
 void Window::set_frameless(bool frameless)
@@ -921,7 +921,7 @@ void Window::set_frameless(bool frameless)
     m_frameless = frameless;
     if (!is_visible())
         return;
-    WindowServerConnection::the().set_frameless(m_window_id, frameless);
+    WindowServerConnection::the().async_set_frameless(m_window_id, frameless);
 
     if (!frameless)
         apply_icon();

Userland/Services/WindowServer/WindowServer.ipc

@@ -78,7 +78,7 @@ endpoint WindowServer
     invalidate_rect(i32 window_id, Vector<Gfx::IntRect> rects, bool ignore_occlusion) =|
     did_finish_painting(i32 window_id, Vector<Gfx::IntRect> rects) =|
 
-    set_global_cursor_tracking(i32 window_id, bool enabled) => ()
+    set_global_cursor_tracking(i32 window_id, bool enabled) =|
     set_window_opacity(i32 window_id, float opacity) =|
 
     set_window_alpha_hit_threshold(i32 window_id, float threshold) =|
@@ -87,8 +87,8 @@ endpoint WindowServer
 
     set_window_has_alpha_channel(i32 window_id, bool has_alpha_channel) =|
     move_window_to_front(i32 window_id) =|
-    set_fullscreen(i32 window_id, bool fullscreen) => ()
-    set_frameless(i32 window_id, bool frameless) => ()
+    set_fullscreen(i32 window_id, bool fullscreen) =|
+    set_frameless(i32 window_id, bool frameless) =|
     popup_menu(i32 menu_id, Gfx::IntPoint screen_position) =|
     dismiss_menu(i32 menu_id) =|
 
@@ -127,10 +127,10 @@ endpoint WindowServer
 
     get_global_cursor_position() => (Gfx::IntPoint position)
 
-    set_mouse_acceleration(float factor) => ()
+    set_mouse_acceleration(float factor) =|
     get_mouse_acceleration() => (float factor)
 
-    set_scroll_step_size(u32 step_size) => ()
+    set_scroll_step_size(u32 step_size) =|
     get_scroll_step_size() => (u32 step_size)
 
     get_screen_bitmap(Optional<Gfx::IntRect> rect, Optional<u32> screen_index) => (Gfx::ShareableBitmap bitmap)
@@ -138,7 +138,7 @@ endpoint WindowServer
 
     pong() =|
 
-    set_double_click_speed(int speed) => ()
+    set_double_click_speed(int speed) =|
     get_double_click_speed() => (int speed)
 
     get_desktop_display_scale(u32 screen_index) => (int desktop_display_scale)