When opening .otf files, Kate is the default application instead of KFontView. STEPS TO REPRODUCE 1. Acquire a font that is in .otf format 2. Try to open it with a double-click 3. Watch Kate cry OBSERVED RESULT Kate attempted to open the .otf file when I double-clicked it and could only display gibberish. With .ttf files, KFontView opened them on a double-click and it worked fine. EXPECTED RESULT KFontView should automatically open .otf files on a double-click. SOFTWARE/OS VERSIONS KDE Plasma Version: 5.21 KDE Frameworks Version: 5.79 Qt Version: 5.15.2
Confirmed. I think I see the problem: the file associations KCM has *.otf listed as the filename pattern for File type "application/vnd.oasis.opendocument.formula-template", AKA "OpenDocument Template" The actual filename extension for this file type is ".ott", not ".otf".
Of course that implies that LibreOffice Math should try to open it rather than kate, but clearly the duplicated entries for *.otf is the main problem here.