Bug 500331

SUMMARY
Font feature codes entered into the font selection window of the profile settings are gone after restart of Konsole.

STEPS TO REPRODUCE
1. Edit custom profile, select a font with font features, e.g. FiraCode (https://github.com/tonsky/FiraCode)
2. In the font dialogue, enter font feature codes (e.g. "ss05" will show a variant of the @ character in FiraCode)
3. Save settings, everything works as intended, the feature is active in the terminal.
4. Close Konsole, reopen. Try the feature in the terminal. Open the font settings of the same profile.

OBSERVED RESULT
The font feature textbox is empty; the previously selected font feature is inactive in the terminal.

EXPECTED RESULT
The font feature textbox shows the font feature codes from before; the previously selected font feature is active in the terminal.

SOFTWARE/OS VERSIONS
Linux/KDE Plasma: Fedora Linux 41 KDE Spin
KDE Plasma Version: 6.3.0
KDE Frameworks Version: 6.11.0
Qt Version: 6.8.2

ADDITIONAL INFORMATION
I did some digging: After saving the Font feature settings, Konsole's "*.profile" file contains no line that saves the font feature string, only the font name+size. The editor Kate on the other hand saves the Font features in a separate line beginning with "Text Font Features=" inside its "katerc" config file and doesn't have this problem.