https://bugs.kde.org/show_bug.cgi?id=427877
Bug ID: 427877
Summary: tk apps fail to start with unknown color name
"BACKGROUND" after upgrading to Plasma 5.20
Product: systemsettings
Version: 5.20.0
Platform: Gentoo Packages
OS: Linux
Status: REPORTED
Severity: major
Priority: NOR
Component: krdb
Assignee: kdelibs-b...@kde.org
Reporter: ma...@laitl.cz
Target Milestone: ---
Created attachment 132487
--> https://bugs.kde.org/attachment.cgi?id=132487&action=edit
xrdb -query output. Are colour definitions missing?
STEPS TO REPRODUCE
1. Use plasma-desktop 5.20 on Linux
2. Try to start a Tk based gui application, like gitk
OBSERVED RESULT
Fails to start with the following in the console:
```
$ gitk
application-specific initialization failed: unknown color name "BACKGROUND"
Error in startup script: unknown color name "BACKGROUND"
(database entry for "-background" in widget ".")
invoked from within
"load /usr/lib64/libtk8.6.so Tk"
("package ifneeded Tk 8.6.8" script)
invoked from within
"package require Tk"
(file "/usr/bin/gitk" line 10)
```
EXPECTED RESULT
Tk apps start normally. This was the case with Plasma 5.19.
SOFTWARE/OS VERSIONS
Linux/KDE Plasma: Gentoo Linux (X11)
KDE Plasma Version: 5.20.0
KDE Frameworks Version: 5.74.0
Qt Version: 5.15.1
ADDITIONAL INFORMATION
This has the same symptoms as one old issue reported to Red Hat Bugzilla:
https://bugzilla.redhat.com/show_bug.cgi?id=1043686
This has been patched by Red Hat somehow, but I was unable to find the exact
patch.
The problem seems to stem from krdb trying to update xrdb so that colours of
non-KDE apps match ones set in KDE settings as mentioned in
https://github.com/KDE/plasma-workspace/blob/master/kcms/krdb/ad/README
I'm adding output of `xrdb -query`.
One work-around mentioned on the Red Had bugzilla was to disable `Apply colors
to non-KDE4 applications` in System Settings -> Application Appearance ->
Colors -> Options - but I was unable to find this setting in Plasma 5.20.
Another harsher work-around is to reset xrdb with `xrdb -load /dev/null` - but
that has unwanted side-effects.
This seems to be happening to multiple people with Plasma 5.20, e.g.
https://www.reddit.com/r/kdeneon/comments/jckwxk/help_cant_run_gitk_on_kde_520/
Reading https://stackoverflow.com/questions/25357156/gitk-package-require-tk
(which is not directly related to the bug), it seems that krdb should put
entries like:
`#define BACKGROUND #b58900`
into xrdb, but it may not be doing so properly (just guessing)
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