As I said I think Scintilla already has the option so somebody just has to add the capability to a plugin (or Geany itself if there is an option so the current behaviour is also available, but people complain there are too many options already, so a plugin is better).
PS I noticed you closed previous issues when I said somebody has to do it. To be clear, Geany is a totally volunteer project, there is no corporate or dedicated individual backing it, so nobody can be directed to implement any feature request, nothing happens unless somebody contributes it.