Handle fullscreen windows in vectorToWindowIdeal

[dranull]

Describe your PR, what does it fix/add?

Clicking in a fullscreen window over the decoration area (gaps, border, groupbar) of other windows will pass the mousedown event to the other window in some cases.

Example: With two (or more) tiled windows on a workspace, activating fullscreen for one of them, then clicking over the area where another window had a groupbar (or when using no_gaps_when_only = yes with resize_on_border = yes) wasn't possible (it was interactive with the groupbar).
Most notable annoyances were the inability to click on browser tabs, or to simply drag the scrollbars.

Problem: m_vWindows is sorted from bottom to top. Fullscreening a window will put it at the end of that list, so it will be always the last to be checked. However, other tiled windows can be under the cursor at the same time (beneath the fullscreen window), and if one matches, vectorToWindowIdeal will return it first.

Solution: check in reverse order, so the top window will be returned first, or first check for fullscreen windows on the workspace.

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

I've left some other minor changes in the code, while testing, if you don't mind.
Also, most probably fixes #2847.

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

I guess.

[vaxerski]

yep, lgtm.

Tiled windows should never be focused if there is a fullscreen one :)

[dranull]

Sure, but I was thinking about an edge case, like this:

But it turns out, even fake fullscreen will make the popup completely disappear. I should have tried...

[fharsanto]

Just FYI,
hello @vaxerski, this version make screensharing in OBS / zoom / brave-bin is not work (blackscreen).

OS: Arch linux

Now i'm using this version for working screensharing 23942fa

Hyprland, built from branch HEAD at commit 23942fa4d684a11322ae19187364a87a8b1a0271 dirty (fix 2456).
Tag: v0.32.3-97-g23942fa4

[vaxerski]

I don't think it's related to this mr.