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Selection Shading Failures in Dark Themes

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Using Thunderbird on completely updated testing/Sid system using only 
the main repository (so no non-free firmware) I'm seeing an unusual 
issue in the left pane of the mail client (where the folders are listed).

When the client is first started its appearance is normal, with 
whichever folder has been selected highlighted in blue. The moment 
another pane (like the message window) or the window of another 
application receives focus, the blue highlight in the folder window is 
lost. I think this part may be normal behavior. But when focus is 
returned to the folder list, the blue color does not return to the 
selected folder.

This does not occur with any of the light themes. On my system the 
behavior happens in the Adwaita-Dark, Arc-Dark, Blackbird, and 
Greybird-Dark themes under Xfce.

The video controller on this system:

Intel Corporation CoffeeLake-U GT3e [Iris Plus Graphics 655] (rev 01)

The same selection color issue is seen with variations of this behavior 
on two other systems with other Intel Corporation graphics subsystems.

All of the dark themes except for Adwaita-Dark also present fields being 
edited in GnuCash as black on very dark gray, making them just about 
impossible to use with that application, but I think this is probably 
unrelated to the other issue.

I can't file a bug report because I have no idea whether this is a:

1. driver problem
2. theme problem
3. problem with specific applications

If I can find a way to resolve it, I'll be grateful. The dark themes are 
very much easier on my particular set of eyes.

BTW, I have tried various other dark themes (all of the themes available 
in Debian's main repo, I think) to no avail.

I'd appreciate suggestions. I may not be quick to respond, but I'll do 
my best to get back in a timely manner.

Thanks,
JP

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Selection Shading Failures in Dark Themes James Wallen <jpwallen@comcast.net> - 2021-02-13 00:10 +0100

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