Fix submitted upstream in https://sourceforge.net/p/scintilla/bugs/1774/

Confirmed on
08:59:15: Geany INFO : Geany 1.26 (git >= 31325bb), en_AU.UTF-8
08:59:15: Geany INFO : GTK 3.10.8, GLib 2.40.2

On GTK3 it was fixed by the 3.6.1 update, e.g. in 04ef30e

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