Only generated preferences show `NON_DEF_CHAR` "●" when changed

Is there an existing issue for this?

• I checked and did not find my issue in the already reported ones

Describe the bug

The darktable preferences dialog is using three different code-paths to create individual preferences:

1. "general" preferences hard-coded in init_tab_general()
2. auto-generated preferences in tools/generate_prefs.xsl
3. Lua preferences in src/lua/preferences.c
4. (not in the dialog but still preferences) dt_gui_preferences_bool() used by the map preferences and by the "import to library..." dialog

Steps to reproduce

Only the auto-generated preferences have code to display the "●" bullet when a preference has been changed by the user. For consistency purposes, use-cases 1 and 3 should also make use of that.

Expected behavior

No response

Logfile | Screenshot | Screencast

Previous discussion in #19740

Commit

No response

Where did you obtain darktable from?

darktable.org / GitHub release

darktable version

5.3

What OS are you using?

Linux

What is the version of your OS?

Debian 13

Describe your system

No response

Are you using OpenCL GPU in darktable?

None

If yes, what is the GPU card and driver?

No response

Please provide additional context if applicable. You can attach files too, but might need to rename to .txt or .zip

No response

Start by comparing the generated-preference path in tools/generate_prefs.xsl with the hard-coded preferences in init_tab_general() and Lua preferences in src/lua/preferences.c. Review the previous discussion in #19740 and inspect dt_gui_preferences_bool() for related behavior. Done means changed preferences in these paths consistently display the "●" marker.