WinUI: Rendering Resolution option partially broken since v0.9.6-877-g8a2b50a

[thedax]

The aftermath of the scaling cleanup continues. By partially broken, I mean the Rendering Resolution option under Game Settings does literally nothing until the window is resized (or the Window Size option is used to pick a size that's different from the current one), or the user goes fullscreen/exits it back to windowed mode.

Responsible commit is 8a2b50a. Last working build is ca9d0ea.

Not that it's really needed, but, steps to reproduce:

1. Open PPSSPP.
2. Start a game.
3. Change the rendering resolution to something different.
4. Observe that nothing visibly changes (easiest to see in 3d games), unlike previous builds.
5. Resize the window, or use Game Settings -> Window Size to change it to something different.
6. The game upscales or downscales appropriately.

[solarmystic]

Confirmed and verified. Using the Ctrl-1 shortcut in any game is the easiest way to reproduce this issue. Start off with Auto, and then spam the shortcut repeatedly. No changes to the rendering resolution can be observed.

This really only affects the ability of the desktop builds to observe those rendering resolution changes in realtime. Mobile builds do it by exiting to the NewUI to do it each time, and doing it that way still works properly.

[hrydgard]

Thank you, sorry about this. I will fix it up tonight.

I had to do the sizing in a cleaner way to be able to introduce various fun features later like stereo rendering, and introduced some bugs in the process apparently.

[thedax]

That fixed it, thanks.