new two-finger multi-select results in random background color

[r10s]

when using the new two-finger multi-select gesture from #2349 , the background is often grey, but sometimes white.

it happens when scrolling around, did not find a way to reproduce it reliably.

here an example - notice at the end, some checks have a grey background, some a white background:

RPReplay_Final1730474662.mov

i first thought, this is an issue because of unset reuse variables (so the random would result from either pined or non-pinned being reused) but that is not true (i tried by using other green/yellow for pinned/unpinned - still, the background was sometimes grey, sometimes not)

[Amzd]

Can probably be fixed with a cell.selectionStyle = .none and setting a custom background color when selected?

[r10s]

thanks for the hint! setting a background color to selectedBackgroundView did the trick. changing selectionStyle did not help or even prevent the checkboxes from working, at least in combination with selectedBackgroundView, but i also did not invetigate too deep as we have sth nicely working with #2365 now