[rcore][GLFW] Update window position in WindowMaximizeCallback()

[rossberg]

Update window position in WindowMaximizeCallback, since maximization does not appear to trigger WindowPosCallback on some platforms, such as MacOS.

Fixes #5931.

[raysan5]

@rossberg what about other platforms? this change can break other platforms

[rossberg]

@raysan5, how can it break anything? I assume that the intended invariant of CORE.Window.position is that it is always in sync with the actual window position. So in the worst case, it's a redundant call on platforms where Maximize already triggers the Pos callback (such as Win32).

(The minor cost of that redundancy seems fine, given that maximising/restoring a window is highly infrequent, and slow anyway.)

[raysan5]

@rossberg did you test it in other platforms? I've been in this situation too many times...

[rossberg]

It seems to work on MacOS and Windows. I can't test other platforms, unfortunately.

[raysan5]

@rossberg I will test it on Windows, Linux, macOS as soon as possible (it could be several months)

[rossberg]

Thanks. The other possible fix for #5931 (GetWindowPosition being broken right now) would be to revert 890ca8d.

[tjammer]

I can confirm that it works on linux