semantic highlighting colors are wrong after switching to the new LSP-based editor

[vkrevs]

Eclipse IDE for C/C++ Developers (includes Incubating components) on openSUSE 15.6 with KDE/X11.

Version: 2025-09 (4.37.0)
Build id: 20250905-1456

Long-time Eclipse CDT user here. I've set up custom semantic highlighting colors via Preferences->C/C++-->Editor->Synax Coloring as in the screenshot below.

I believe this is done via the following in org.eclipse.cdt.ui.prefs file:

semanticHighlighting.externalSDK.color=138,226,52
semanticHighlighting.function.color=13,209,64
semanticHighlighting.functionDeclaration.color=78,154,6
semanticHighlighting.globalVariable.bold=true
semanticHighlighting.globalVariable.color=136,138,133
semanticHighlighting.globalVariable.enabled=true
semanticHighlighting.macroSubstitution.color=13,209,64
semanticHighlighting.macroSubstitution.enabled=true
semanticHighlighting.macroSubstitution.italic=true
semanticHighlighting.method.bold=true

Tried switching to the new LSP-based editor.

Expected results:
Semantic highlighting colors/keyword boldness/etc are the same as before. Preferences->C/C++-->Editor (LSP) has a "Synax Coloring" node for further customization if necessary.

Actual results:
Semantic highlighting colors/keyword boldness/etc are all reset to some defaults. Preferences->C/C++-->Editor (LSP) has no "Synax Coloring" node for further customization.

Switching back to non-LSP editor restores my custom color highlighting, etc

[ghentschke]

Thanks for the detailed feedback. Currently these settings are not supported by the new CDT LSP based editor, because its using the TextMate defined Themes: (See Eclipse Preferences --> TextMate)
These themes are defined via .css files. You can add custom themes via Preferences --> TextMate --> Theme.

Unfortunately it's currently not possible to import or edit theme settings.