Pause rendering when the window is minimized

[abcdefg30]

Closes #18354.

Split from #17837.
Still renders when the window just loses focus.

[pchote]

Before I start debugging, have you verified that this works as expected on windows?

A quick test on macOS shows that the rendering never restarts after unminimizing the window. Audio works, but the rendering remains frozen on the last frame before minimizing.

[abcdefg30]

Of course. This must be some more macOS weirdness, maybe similar to

OpenRA/OpenRA.Platforms.Default/Sdl2PlatformWindow.cs

Line 232 in e5dc030

if (Platform.CurrentPlatform == PlatformType.OSX)

?

[abcdefg30]

@pchote did you have any luck looking into this or can give me any hints?

[pchote]

Oops, I forgot about this. Please remind me to look into this on the weekend.

[Mailaender]

I tested this on Linux. No regressions, but I am also not sure if it actually pauses the renderer. I run OpenRA in window mode.

[abcdefg30]

Rebased and updated. I simply disabled this for OSX now.

[pchote]

After fixing the events on macOS this has a nice sideeffect of working around the bug where minimized windows don't trigger on vsync, meaning that OpenRA renders at huge FPS eating all your CPU and GPU resources while minimized (not that anybody ever actually uses minimise on macOS...).

[pchote]

nit: the comment and PR messages say "Only render the game when the window is maximized" which implies that it doesn't render during regular non-maximized use. Change to "Pause rendering when the window is minimized"?

[teinarss]

Works on Win10

[abcdefg30]

Updated.

[pchote]

https://github.com/OpenRA/OpenRA/wiki/Changelog-(bleed)/_compare/b39d8aa91e7cf87c057477a6b320b8f94fa8fb23