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Unreadable tab-text and other color issues

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Where did you get that updated CodeBlocks from? Your scarce description sounds like this CodeBlocks is linked against wxWidgets 3.0.x and you are using a dark desktop theme. wxWidgets 3.1.x (not sure how big x needs to be) has lots of improvements for dark themes, using such a recent version should fix the described problems.

Actually, I'm not 100% sure, I will need to check when I get home - at some stage a while back I was running a home-built version becuase the Fedora repo was so far behind.

But, I'm pretty sure I am now running the Fedora F34 Mainline version.

The info page in the about dialog has this info and we don't need to guess.
The major problem is that the wxAUI stuff we use doesn't work too well on GTK3.
For GTK2 we had a notebook (the edtior tab control) decorator/art which looked sort of good.
Unfortunately GTK people  love to break these things and this needs to be done from scratch for GTK3 and probably soon for GTK4.
Until then it will look bad with some themes...
It seems more and more distros are dropping GTK2, so I suppose we'll be forced to do this porting work soon.

Can we see at least an image with problem? There is too much guessing...

Here's the info.  I checked to be sure I wasn't running my own build - this is from the Fedora F34 Release repository.  Attachment image.
This is after I have spent at least 30 minutes playing with some settings trying to get a readable UI.  The Introduction, or Home screen - or whatever it is called - was very dark blue text on black background, and so was totally unreadable.  The default font has been changed to "Source Code Pro" and font sizes increased to 11 (or possibly 12) .  I'm pretty sure I have adjusted a few other things, but I can't remember. 

Anyway, you can see that the text on the non-selected tabs is virtually unreadable.  I haven't managed to make this any better.

Name             : Code::Blocks
Version          : 20.03-r11997
SDK Version      : 2.0.0
Scintilla Version: 3.7.5
Author           : The Code::Blocks Team
E-mail           : [email protected]
Website          :

wxWidgets Library (wxGTK port)
Version 3.0.5 (Unicode: wchar_t, debug level: 1),
compiled at May  6 2021 00:00:00

Runtime version of toolkit used is 3.24.
Compile-time GTK+ version is 3.24.29.


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