renderer: fix uvBR calculation

[PaideiaDilemma]

Describe your PR, what does it fix/add?

Fixes #1462 I think

This looked odd to me, so i added the parenthesis and then the resizing stretches in electron apps disappeared.

Is there anything you want to mention? (unchecked code, possible bugs, found problems, breaking compatibility, etc.)

May conflict with #7499 I will check
Does not conflict with #7499

Is it ready for merging, or does it need work?

Needs confirmation that this is (more) correct and someone testing

[fybx]

looks fine on my end. tested chromium and obsidian with and without --enable-features=UseOzonePlatform,WaylandWindowDecorations --ozone-platform-hint=auto

[vaxerski]

uhhh I don't know if this is right? unsure. Needs testing

[John-Paul-R]

I can confirm that this definitely appears like a substantially more correct scaling.

Before

2024-10-02_17-49-36_before.c.mp4

After

2024-10-02_18-08-12_after.c.mp4

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I am experiencing substantial stutter overall (not just window rescaling) on the locally-built version, but given the nature of the change, I suspect that's more an artifact this being my first install not via package manager, and I've borked something.

[vaxerski]

I realize chromium is better but are other things not broken xd

chromium popups, gtk apps, etc

I think gtk disables shadows now that we sent maximize, so add this patch to revert that one and check native wl gtk aspps

patch.txt

(don't actually use it it's just for testing)

[PaideiaDilemma]

Ran it today and also just tested gtk 3 and 4 apps with the patch.
Did not find any issues so far.

[vaxerski]

alright, thanks then