Impossible to change default text font

[vkrevs]

• [X ] I verified I can reproduce this issue against latest Integration Build of Eclipse SDK Downloaded and installed eclipse-cpp-2024-03-R-linux-gtk-x86_64.tar.gz on openSUSE 15.5 under KDE.

Steps to reproduce

From a fresh installation and clean workspace:

• Start eclipse. open new workspace
• Select Window->Preferences->General->Appearance->Colors and Fonts->Basic->Text Font
• "Preview" says "Cascadia Code 10" is selected. Cascadia Code is not a font referenced in KDE's font setttings nor in Gnome's font settings.
• Click Edit and select any other font, e.g. FiraCode NF Retina, click Select
• "Preview" says "Fira Code NF 10".
• Click "Apply and Close" and exit/restart Eclipse.
• Select Window->Preferences->General->Appearance->Colors and Fonts->Basic->Text Font.
• "Preview" displays ""Fira Code NF 10". Click on any item above "Text Font" and back on "Text Font" -> "Preview" displays "Cascadia Code 10".

Clicking on "Restore Defaults" and selecting the font I want results in identical behavior.

I tried to edit org.eclipse.ui.workbench.prefs and replace references to Cascadia Code with another font. Once Eclipse starts, it ignores these and forces Cascadia Code again.

I searched under $HOME for any files containing "Cascadia" - only org.eclipse.ui.workbench.prefs contains references to it.

dconf dump / | grep -i cascadia results in nothing. So where does Eclipse pick up the preference for Cascadia Code from?

I expected: My selected font to remain selected.

Copies of ECLIPSE_HOME/configuration and /.metadata are attached. .metadata.tar.gz configuration.tar.gz

Tested under this environment:

• OS & version: openSUSE 15.5, KDE
• Eclipse IDE/Platform version (as shown in Help > About): Eclipse IDE for C/C++ Developers (includes Incubating components), Version: 2024-03 (4.31.0), Build id: 20240307-1437

[vkrevs]

https://bugs.eclipse.org/bugs/show_bug.cgi?id=569961 seems similar, except in my case everything happens with the default colour and font theme, instead of reduced palette one.