Windows 11 has strange behavior with Alt-Tab.
In some cases an Alt-Press event is sent to the window immediately
after it is de-activated (both Left & Right Alt keys for some reason
even when only one is held).
This meant that:
- Modifiers could be enabled for de-activated windows
(so we can't assume de-activated windows have modifiers released).
- Releasing the modifier key would not be sent to the inactive window
causing the modifier key to be stuck.
- Button events over an inactive window are generated before activation,
so even though activation reads the correct modifier state,
the button event uses the "stuck" modifier state.
Now button & drop events on inactive windows always read the modifier
state first instead of relying on the modifier state to be cleared.
This has some advantages:
- If modifiers are held, they will be used as part of the click action.
- While modifier keys on inactive windows should be rare,
in the case this does happen - stuck keys are avoided.
So it makes sense to apply these changes for all platforms.
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