Currently no menu items in Geany have ellipses ("..."). It would be nice to have these on commands such as File->Open..., File->Save As... and so on - that would be consistent with other GNOME programs.
I've attached a patch that implements this.
It's in the GNOME HIG and quite common on Win32 if I remember correctly.
Unless the maintainer disagrees, I think we could apply this patch
Good idea, implemented in Git.