renderer: fix uv scaling detection

[vaxerski]

Fixes scale unaware apps (legacy wl scaling) after #11770

cc @fxzzi @gulafaran for testing if I didnt break anything

[tannerellen]

I had scaling issues in Thunar after #11770 and this fixes it.

[vaxerski]

check again pls

[tannerellen]

check again pls

OK, still looking good for the sizing. However it does look like #11770 and later have brought back the resize bouncing that was made better some time ago.

Here is after #11770:
https://github.com/user-attachments/assets/cfde3884-7484-427d-86a7-8cdf418416ca

Here is before #11770:
https://github.com/user-attachments/assets/f6d5e8b7-5cef-4d73-973a-dcbcb8a0414b

It was never perfect but it's a pretty dramatic difference. I don't have any other apps that have this issue, just Thunar. I'm not super concerned personally because I use Thunar tiled but I'm happy to test if you want to try and make it better.

[gulafaran]

seems to work as intended on my apps

[vaxerski]

@tannerellen are you scaling?

[vaxerski]

I'll merge this in the meantime and hopefully fix the above in a subsequent mr

[tannerellen]

@tannerellen are you scaling?

Yeah I'm scaling my 4k monitor @ 1.875. I just tried scaling 2 and 1 (no scaling) and it exhibits the same jumpy behavior as my video regardless.