Make sure sure that the colors of selected icons are still noticeable when the email is selected

Reassigning this to Richard

Pushed by mkmelin@iki.fi:
https://hg.mozilla.org/comm-central/rev/f28692b39ccd
Increase the selector specificity of the star, read, spam and select colors. r=aleca

Thanks for fixing this issue! But is it expected that the icon color is still very different if the row has the focus? I expected that "maintain the color when the row is selected" means that the color is the same for selected and not selected rows, as it was in Thunderbird 102. Please see the attached screenshot and compare the color values for the star icon.

Tested on macOS 13.2.

Those icons have a transparency, so if the background color of the selected row is blue, the transparency of the icon slightly affects it's color.
A very minor variation need to ensure a visual feedback when the user hovers those icons with the mouse.
In 102, those icons don't have any visual response.

We will explore other solutions for a more noticeable hover effect that doesn't rely on transparency, but the way they currently behave and look is expected.

Oh, I didn't notice that there is now a hover effect on the star icon. That explains it, of course. Thank you for clarifying!