Fix redisplay of frame after loading new fonts

* src/xdisp.c (redisplay_internal): When retrying redisplay of a
frame because new fonts were loaded, disable all redisplay
optimizations on that frame by calling SET_FRAME_GARBAGED.
(Bug#20410)

1 files changed, 11 insertions, 0 deletions

diff --git a/src/xdisp.c b/src/xdisp.c
index 5a27adc2b18..c2f0b747c6e 100644
--- a/src/xdisp.c
+++ b/src/xdisp.c
@@ -13359,6 +13359,13 @@ redisplay_internal (void)
 	  if (f->fonts_changed)
 	    {
 	      adjust_frame_glyphs (f);
+	      /* Disable all redisplay optimizations for this frame.
+		 This is because adjust_frame_glyphs resets the
+		 enabled_p flag for all glyph rows of all windows, so
+		 many optimizations will fail anyway, and some might
+		 fail to test that flag and do bogus things as
+		 result.  */
+	      SET_FRAME_GARBAGED (f);
 	      f->fonts_changed = false;
 	    }
 	  /* If cursor type has been changed on the frame
@@ -13753,6 +13760,10 @@ redisplay_internal (void)
 		  if (f->fonts_changed)
 		    {
 		      adjust_frame_glyphs (f);
+		      /* Disable all redisplay optimizations for this
+			 frame.  For the reasons, see the comment near
+			 the previous call to adjust_frame_glyphs above.  */
+		      SET_FRAME_GARBAGED (f);
 		      f->fonts_changed = false;
 		      goto retry_frame;
 		    }