[Gtk] MediaPlayerElement blocks all pointer inputs after unloading

[ramezgerges]

Current behavior

Try the Mini player sample in SamplesApp. Wait for the video to open and then go to any other sample. You'll find that all pointer inputs to the lower 90% of the window are blocked. It seems that the native media player is not unloading correctly, so it's blocking the input.

Expected behavior

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How to reproduce it (as minimally and precisely as possible)

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Workaround

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Works on UWP/WinUI

None

Environment

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NuGet package version(s)

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Affected platforms

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IDE

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IDE version

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Relevant plugins

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Anything else we need to know?

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