Correct layout for notched android devices about glfm

[brackeen]

Thanks for the issue, @ddovod. This is added in 379d085

A couple things:

• When backgrounding and then foregrounding, there was a crash when setting layoutInDisplayCutoutMode in _glfmSetFullScreen. To avoid this, layoutInDisplayCutoutMode is set once on startup.
• Safe insets are only used for fullscreen mode, otherwise system window insets are used.

I think this covers all the cases, but feel free to create another issue if you see any problems.

[Anuken]

This change makes handling notched layout significantly less convenient for certain apps, since it forces the application itself to handle notches and safe insets. I would like to be able to specify the type of notch behavior, or at least disable this code and use the default (black bars around notch).

@brackeen Would you accept a PR to make this behavior configurable? What would be the best way to achieve this - through a new surface configuration option, or a #define NOTCH_NO_SHORT_EDGES switch?

[brackeen]

@Anuken I'm not sure "black bars around notch" would work on iOS, because the App Store requires notch support. It's probably better to handle notches on the app level, but having adding Android-only switch would be fine.

[Anuken]

the App Store requires notch support

Strange, I had an app on iOS with no notch support for more than a year, and the review system didn't have any issue with it. In fact, I even had screenshots with black bars visible on the store.

It's probably better to handle notches on the app level

That's fair, but the app I'm using GLFM for currently doesn't target iOS, so black bars on Android are acceptable.