NOTIFICATION_WM_MOUSE_ENTER doesn't emit when mouse button is being pressed

[Schweini07]

Godot version

3.3 Stable, v4.0.dev.custom_build [916c37d]

System information

Manjaro Linux

Issue description

When normally entering the game with the mouse, the NOTIFICATION_WM_MOUSE_ENTER notification is emitted. But when a file is dragged into the game nothing happens. This issue is present in both Godot 3.3 and Godot 4.0-dev.

2021-09-28.13-07-34.mp4

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Steps to reproduce

1. Create a Node with a script including this code (3.3):

func _notification(what):
  if what == MainLoop.NOTIFICATION_WM_MOUSE_ENTER:
     print("Emitted")

2. Try to drag a file into the game window, "Emitted" is not printed.

Minimal reproduction project

Test.zip

[KoBeWi]

Might be not caused by file dragging, but the pressed mouse button. See #20881

[Schweini07]

Then this is a duplicate, I suppose?

[KoBeWi]

Ok I confirmed this is the same problem. But it involves windows not Controls, so it's probably triggered somewhere else. I'd leave it open.

[MadDogMayCry0]

Godot version

3.3 Stable, v4.0.dev.custom_build [[916c37d]

No one can correct this mistake, since no one wants to delve into the problem and does not consider it a problem. Nevertheless, this is a problem :) and this problem leads to unpredictable behavior of your game :)

This problem is solved by the logical layer that I attached in the adjacent branch, but it is not as effective as if it was solved natively, although it works correctly as you expect.
#20881 (comment)