Can't get input event for mouse then window losing|regaining focus

[kzerot]

Godot version

3.3.2

System information

Linux Manjaro, Win10, any hardware

Issue description

Working on some software, need to make drag'n'drop feature for files, but need to drop files on specific controls.
When you switch to Godot window and some mouse button is pressed, there are no Input Events fired for mouse motion|buttons unless you release button (releasing button also not fired). get_global_mouse_position() returns last mouse position before window switching.

Steps to reproduce

1 Start any app
2 drag'n'drop any file into window, or just press mouse button and then alt-tab to your app
3 As you can see InputEvents will fire only AFTER you release mouse button

Minimal reproduction project

Small project with label shows mouse global coordinates
MouseBug.zip

[kzerot]

Also I think it's connected with
#33928