Task switcher on Mint-Y theme does not highlight selected task any more after update to Xia 22.1

[cfbutt]

Distribution

Mint 22.1

Cinnamon Package version

6.4.6

Graphics hardware in use

Intel Corporation UHD Graphics 620

Frequency

Always

Bug description

Post upgrade to LM 22.1, when using the Mint-Y theme, the task switcher does not highlight the selected task any more if you use the Mixed or Dark appearance. Only using Light appearance, the selected task icon is highlighted with a grey shadow. Till LM 22.0 the selected task (icon) was clearly highlighted by a variation of the theme color.

What is highlighted are the applications in foreground (terminal and xed in my example) compared to the applications in background (system monitor and chrome in my example).

But the selected application (system monitor in my example) can only be deducted by the preview window below. The problem with the preview window is, that it opens with a delay and it is not so useful if you want to move fast between 10 or 20 open app windows with ALT + TAB. Till LM 22.0 the selected app icon was surrounded by a clearly visible background/border in theme color.

Steps to reproduce

1. Upgrade to LM 22.1 (may happen with a fresh install too?)
2. Enable the Mint-Y theme with Mixed or Dark appearance
3. Start at least two applications
4. Call task switcher with ALT + TAB. Mantain ALT pressed and switch between tasks by pressing repetitively TAB

Expected behavior

The actual selected task (icon) should be clearly highlighted. Till LM 22.0 a variation of the theme color was used to highlight the selected task (icon) for all appearances (Light, Mixed, Dark). This was a perfect solution.

Additional information

linuxmint/cinnamon#12674