Sub-window does not capture mouse_entered() / mouse_exited() events on Area2D

[JHaller27]

Tested versions

• Reproducible in 4.0-stable (did not check further back)

System information

Godot v4.3.stable (77dcf97d8) - Windows 10.0.19045 - Vulkan (Forward+) - dedicated NVIDIA GeForce RTX 3070 (NVIDIA; 32.0.15.6094) - AMD Ryzen 5 5600X 6-Core Processor (12 Threads)

Issue description

With Area2D nodes correctly configured in both the main window and sub-window...

Expected Area2D's mouse_entered & mouse_exited signals should fire when the mouse enters/exits the collision shape in both the main window and sub-window.

Actual The mouse_entered & mouse_exited signals do not fire in the sub-window.

Steps to reproduce

• Create a main scene with a Node2D
• Add a Window child node
  • Set size to 256 x 256
  • (Optional) Set initial position to Center of Primary Screen
• Add a Node2D as a child of Window
• Under both the top-level Node2D and the Node2D child of the Window...
  • Add an Area2D
  • Set Position to (100px, 100px)
  • Add a Sprite2D under the Area2D; set the Texture to the default icon.svg
  • Add a CollisionShape2D under the Area2D; set the Shape to a RectangleShape2D; set the Rectangle size to 128 x 128
  • Attach the following GDScript script to the Area2D

    extends Area2D
    func _on_mouse_entered() -> void:
    self.modulate = Color.RED
    func _on_mouse_exited() -> void:
    self.modulate = Color.BLUE

  • Connect the mouse_entered and mouse_exited signals from the Area2D to the respective GDScript functions
• Save scene and run project
• Move cursor over each sprite and observe the color change (or lack thereof)

Minimal reproduction project (MRP)

SubWindowMouseBug.zip

[komugi1211s]

Checking the Viewport -> Physics -> Object Picking property in sub-window will make the viewport pick the object inside the window.

[JHaller27]

Can confirm this works. Thanks, @komugi1211s! I'm not sure why the ability to pass through mouse events defaults to false... Could that be changed?

[Sauermann]

Object picking can be an expensive operation and should be enabled only if needed. So currently I believe, that a change of the defaults is very unlikely to happen.