In project/projectmodel.cpp the method iconNameForPath(...) looks up the icon name for a file by its mimetype. But then it caches the icon name by the file extension, which breaks for all files with name extensions which are not only used with one mimetype. So if there are e.g. both a CMakeLists.txt and a README.txt file, whatever file is handled first defines the icon used for the other, due to both sharing "txt".
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This bug has been in NEEDSINFO status with no change for at least 30 days. The bug is now closed as RESOLVED > WORKSFORME due to lack of needed information. For more information about our bug triaging procedures please read the wiki located here: https://community.kde.org/Guidelines_and_HOWTOs/Bug_triaging Thank you for helping us make KDE software even better for everyone!