I built SciTE with GTK+2 and I can reproduce [the problem](https://github.com/geany/geany/issues/1521#issuecomment-309974845) there. But applying the patch from [Scintilla #1949](https://sourceforge.net/p/scintilla/bugs/1949/) doesn’t fix it (although it does fix the problem described in Scintilla #1949).