bug#30519: 26.0.91; Emacs hangs with flyspell overlay

[Eli Zaretskii]

> Date: Wed, 21 Feb 2018 10:45:55 +0100
> From: martin rudalics <rudalics@gmx.at>
> 
>  > #0  0x00000000005e25ec in marker_position (marker=XIL(0x376b469)) at 
> marker.c:641
>  > #1  0x00000000005ced7e in mouse_face_overlay_overlaps 
> (overlay=XIL(0x376b4e1)) at buffer.c:3058
>  > #2  0x00000000004a943f in note_mouse_highlight (f=0x1603c80 
> <bss_sbrk_buffer+8226176>, x=170, y=120) at xdisp.c:31349
> 
> Can you please try the attached patch.  I have no idea whether this is
> the correct interpretation of the semantics of 'mouse-highlight'.

Thanks, I think this is the right fix.