From: Eli Zaretskii <eliz@gnu.org>
Date: Sun, 30 Apr 2023 13:24:05 +0000 (+0300)
Subject: Fix redisplay of mode line after its format changes from nil
X-Git-Tag: emacs-29.0.91~69
X-Git-Url: http://git.eshelyaron.com/gitweb/?a=commitdiff_plain;h=ca43435816b7c7ceaef1a6fce967cbdbcf243ea3;p=emacs.git

Fix redisplay of mode line after its format changes from nil

* src/dispnew.c (update_window): Make sure a mode-line's row of
the current glyph matrix is disabled when the mode line is not
being displayed.  (Bug#63186)
---

diff --git a/src/dispnew.c b/src/dispnew.c
index 87ec83acdf3..65d9cf9b4e1 100644
--- a/src/dispnew.c
+++ b/src/dispnew.c
@@ -3748,6 +3748,14 @@ update_window (struct window *w, bool force_p)
 	      }
 	  }
 
+      /* If the window doesn't display its mode line, make sure the
+         corresponding row of the current glyph matrix is disabled, so
+         that if and when the mode line is displayed again, it will be
+         cleared and completely redrawn.  */
+      if (!window_wants_mode_line (w))
+	SET_MATRIX_ROW_ENABLED_P (w->current_matrix,
+				  w->current_matrix->nrows - 1, false);
+
       /* Was display preempted?  */
       paused_p = row < end;