Fix redrawing of mode lines when exposed (Bug#19721)

 src/dispnew.c (adjust_glyph_matrix): Set the update_mode_line flag
 of the window whose current glyph matrix was resized, which
 disables the mode-line row as side effect.
 src/xdisp.c (redisplay_window): Don't avoid redisplay of a window
 whose update_mode_line flag is set.

1 files changed, 6 insertions, 0 deletions

diff --git a/src/dispnew.c b/src/dispnew.c
index f73ea58b7f3..6517c9b5d19 100644
--- a/src/dispnew.c
+++ b/src/dispnew.c
@@ -570,6 +570,12 @@ adjust_glyph_matrix (struct window *w, struct glyph_matrix *matrix, int x, int y
 	      for (i = 0; i < matrix->nrows; ++i)
 		matrix->rows[i].enabled_p = false;
 	    }
+	  /* We've disabled the mode-line row, so force redrawing of
+	     the mode line, if any, since otherwise it will remain
+	     disabled in the current matrix, and expose events won't
+	     redraw it.  */
+	  if (WINDOW_WANTS_MODELINE_P (w))
+	    w->update_mode_line = 1;
 	}
       else if (matrix == w->desired_matrix)
 	{