bug#30519: 26.0.91; Emacs hangs with flyspell overlay

[martin rudalics <rudalics@gmx.at>]

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 > #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, martin

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--- a/src/xdisp.c
+++ b/src/xdisp.c
@@ -31345,7 +31345,8 @@ A polygon is a cons (poly . [x0 y0 x1 y1 ...]) where each pair in the
 	     the one we are currently highlighting, we have to
 	     check if we enter the overlapping overlay, and then
 	     highlight only that.  */
-	  || (OVERLAYP (hlinfo->mouse_face_overlay)
+	  || (!hlinfo->mouse_face_hidden
+	      && OVERLAYP (hlinfo->mouse_face_overlay)
 	      && mouse_face_overlay_overlaps (hlinfo->mouse_face_overlay)))
 	{
 	  /* Find the highest priority overlay with a mouse-face.  */