mouse_exited event/notification called after mouse button released in Control

[HeartoLazor]

Godot version:
Godot 3.0.4

OS/device including version:
Windows 10

Issue description:
When I hold a mouse button inside a control and move outside, the mouse_exited event is called after the button release.
I expect the event after the mouse is outside of the Control area, not after the release of the button.
If I don't hold the button, works as intended.
Here is a video where the half show the weird behavior
https://gfycat.com/IllustriousSoupyHadrosaurus
look at the mouse when it's pressed / released and the console output.

Steps to reproduce:

1. Create a control with stop filter. Register mouse_entered and mouse_exited events.
2. Hold Left or Right click inside the control.
3. Move the mouse outside and the mouse_exited event is ignored

Minimal reproduction project:
mouse_exited_bug.zip

[akien-mga]

Is this still reproducible in the current master branch?

[HeartoLazor]

Still happening in master branch (build.f32c826) compiled today

[akien-mga]

This seems still reproducible in current master / 4.0 alpha 5.
Here's the MRP updated for 4.0: mouse_exited_bug.zip