SUMMARY Add the ability to install TrueType Collection fonts (ttc) from the GUI. I can easly install any .ttf or .otf font files from GUI by "Install" button in context menu. But I can't do it with .ttc fonts, can't even open .ttc with kfontview from GUI. But, however, I can open .ttc by kfontview from the terminal: "kfontview /home/username/Documents/Fonts/font.ttc" And successfully install it. STEPS TO REPRODUCE 1. Get any .ttc font file. 2. Try to install it from GUI OBSERVED RESULT Only with command line. EXPECTED RESULT Install button in the context menu of the .ttc file. SOFTWARE/OS VERSIONS Linux/KDE Plasma: KDE Plasma Version: 5.22.4 KDE Frameworks Version: 5.85.0 Qt Version: 5.15.2 Sorry for my bad English