Multi monitor related fixes (#84)

* Prevent GoZen from going out of 'visible' screen bounds

Like behind the taskbar
Or behind the Copilot sidebar

* Fix window disappearing when main screen's coordinates change

when the coordinates of the main screen were changed and the window was dragged, the window would get a huge offset from where it should be.

* Fix extra window offset on screen position change

This line did not get committed😅

* Unhide titlebar only & "freely" drag b/w monitors

* Fix multi-monitor issue for resize handles

src/ui/screen_main/scripts/main_resize_handles.gd

@@ -25,11 +25,14 @@ func _on_gui_input(event: InputEvent, node: Control):
 
 func _process(_delta: float) -> void:
 	if resizing:
-		var current_scene = get_tree().current_scene
+		var relative_mouse_pos = (
+			DisplayServer.mouse_get_position()
+			- DisplayServer.window_get_position(get_window().get_window_id())
+		)
 		if resize_node in [$Bottom, $Corner]:
-			get_window().size.y = int(current_scene.get_global_mouse_position().y)
+			get_window().size.y = int(relative_mouse_pos.y)
 		if resize_node in [$Right, $Corner]:
-			get_window().size.x = int(current_scene.get_global_mouse_position().x)
+			get_window().size.x = int(relative_mouse_pos.x)
 
 #endregion
 ###############################################################

src/ui/screen_main/scripts/main_top_bar.gd

@@ -6,7 +6,7 @@ extends PanelContainer
 var menu_buttons := []
 
 var move_window := false
-var move_start: Vector2i
+var move_win_offset: Vector2i
 
 
 func _ready() -> void:
@@ -92,15 +92,37 @@ var win_mode: Window.Mode:
 
 func _on_top_bar_dragging(event) -> void:
 	if event is InputEventMouseButton and event.button_index == 1:
-		move_window = event.is_pressed() and win_mode == Window.MODE_WINDOWED
-		if move_window:
-			move_start = get_viewport().get_mouse_position()
-
+		var mouse_pos := DisplayServer.mouse_get_position()
+		var win_pos := DisplayServer.window_get_position(get_window().get_window_id())
+		move_window = false
+
+		if win_mode == Window.MODE_WINDOWED:
+			if event.is_pressed():
+				move_win_offset = mouse_pos - win_pos
+				move_window = true
+
+			elif OS.get_name() == "Windows":
+				var screen_rect := DisplayServer.screen_get_usable_rect(
+					DisplayServer.SCREEN_WITH_MOUSE_FOCUS
+				)
+				var tb_top := Vector2i(mouse_pos.x, win_pos.y)
+				var tb_bottom := Vector2i(mouse_pos.x, win_pos.y + int(size.y))
+
+				if !screen_rect.encloses(Rect2i(tb_top, tb_bottom)):
+					if tb_top.y < screen_rect.position.y:
+						get_window().position = (
+							tb_top.clamp(screen_rect.position, screen_rect.end)
+							- Vector2i(move_win_offset.x, 0)
+						)
+					else:
+						get_window().position = (
+							tb_bottom.clamp(screen_rect.position, screen_rect.end)
+							- Vector2i(move_win_offset.x, int(size.y))
+						)
 
 func _process(_delta: float) -> void:
 	if move_window:
-		var mouse_delta = Vector2i(get_viewport().get_mouse_position()) - move_start
-		get_window().position += mouse_delta
+		get_window().position = DisplayServer.mouse_get_position() - move_win_offset
 
 #endregion
 ###############################################################