It is an open issue. but has been open for more than 10 years! (https://sourceforge.net/p/scintilla/feature-requests/470/) I've been able to tolerate this problem because I love Geany, but now I'm spending a lot of time working on single file VueJS components which have html, css and js in one file so it's become a big problem and I'll need to find a different editor :-(