From: Martin Rudalics <rudalics@gmx.at>
Date: Thu, 22 Feb 2018 07:50:47 +0000 (+0100)
Subject: Skip mouse-face overlap check when mouse-face is hidden (Bug#30519)
X-Git-Tag: emacs-26.1-rc1~172
X-Git-Url: http://git.eshelyaron.com/gitweb/?a=commitdiff_plain;h=83187cd;p=emacs.git

Skip mouse-face overlap check when mouse-face is hidden (Bug#30519)

* src/xdisp.c (note_mouse_highlight): Skip check whether
mouse-face highlighting overlay overlaps other mouse-face
overlays when mouse-face highlighting is hidden (Bug#30519).
---

diff --git a/src/xdisp.c b/src/xdisp.c
index da9c31314ca..b003a2f9ccc 100644
--- a/src/xdisp.c
+++ b/src/xdisp.c
@@ -31357,10 +31357,12 @@ note_mouse_highlight (struct frame *f, int x, int y)
       /* Check mouse-face highlighting.  */
       if (! same_region
 	  /* If there exists an overlay with mouse-face overlapping
-	     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)
+	     the one we are currently highlighting, we have to check
+	     if we enter the overlapping overlay, and then highlight
+	     only that.  Skip the check when mouse-face highlighting
+	     is currently hidden to avoid Bug#30519.  */
+	  || (!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.  */