mouse::Event::ButtonReleased events out of widget bounds

[MichalLebeda]

I wonder how to capture mouse::Event::ButtonReleased events when it occurs out of widget bounds (but initial ButtonPressed occured inside bounds and returned Status::Captured.
For the motivation behind this, please see #1472, but this is not limited to out window bounds, just widget bounds.

[MichalLebeda]

The issue was caused by my code, not Iced.