Resizing in iOS doesn't work correctly after #6107

[HackerFoo]

Description
Resizing is broken in iOS after #6107 in Bevy. See bevyengine/bevy#16604 for details.

Repro steps
This can be reproduced with Bevy's mobile example (in examples/mobile) - make run to launch the app in the simulator, and then rotating the screen shows cropped/stretched graphics.

Expected vs observed behavior
No distortion when rotating the screen.

Platform
iOS, using Bevy

[cwfitzgerald]

cc @madsmtm as probably the most aware metal person

[madsmtm]

Yeah, turns out I was wrong in a few areas when making #6107.

I suspect that #6210 would fix it, but that may take some time, so I guess what I'll do to fix this depends on when you think objc2-metal/#5641 might land?
If ~soon, then we can just merge the aforementioned PR, if not, then I might be persuaded to re-implement the approach that raw-window-metal uses using just objc (but that is a lot of tedious work).

[madsmtm]

Tested the Bevy example now, I can reproduce on Bevy v0.15.1 / Wgpu 0.23, and the issue would be fixed with #6210.

I realize that it's kinda rude to keep pestering you about objc2, so I'm working on a re-implementation for raw-window-metal in wgpu using just objc - it won't be pretty, but it will be.

[madsmtm]

Done in #7026.