Kirill Chibisov cac627ed05 Make 'current_monitor' return 'Option<MonitorHandle>' ...

On certain platforms window couldn't be on any monitor
resulting in failures of 'current_monitor' function.

Such issue was happening on Wayland, since the window
isn't on any monitor, unless the user has drawn something into it.

Returning 'Option<MonitorHandle>' will give an ability to
handle such situations gracefully by properly indicating that
there's no current monitor.

Fixes #793.

2020-09-07 20:09:24 +03:00

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