From: Gerd Möllmann <gerd.moellmann@gmail.com>
Date: Sun, 16 Mar 2025 20:17:55 +0000 (+0100)
Subject: Make sure to initialize glyph::frame to NULL (bug#77039)
X-Git-Url: http://git.eshelyaron.com/gitweb/?a=commitdiff_plain;h=967e6e2ec3490c2dbc1ce390716b434411b0c74b;p=emacs.git

Make sure to initialize glyph::frame to NULL (bug#77039)

* src/dispnew.c (adjust_glyph_matrix): Clear glyph memory when
enlarging window-system window glyph matrices.

(cherry picked from commit eab14d68b2e72b9a6b8b0cc67c9667c2bfbed4f5)
---

diff --git a/src/dispnew.c b/src/dispnew.c
index 9b94ba1bdf0..58817ff014b 100644
--- a/src/dispnew.c
+++ b/src/dispnew.c
@@ -506,8 +506,9 @@ adjust_glyph_matrix (struct window *w, struct glyph_matrix *matrix, int x, int y
 	      row->glyphs[LEFT_MARGIN_AREA]
 		= xnrealloc (row->glyphs[LEFT_MARGIN_AREA],
 			     dim.width, sizeof (struct glyph));
+	      memset (row->glyphs[LEFT_MARGIN_AREA], 0,
+		      dim.width * sizeof (struct glyph));
 
-	      /* The mode line, if displayed, never has marginal areas.  */
 	      if ((row == matrix->rows + dim.height - 1
 		   && !(w && window_wants_mode_line (w)))
 		  || (row == matrix->rows && matrix->tab_line_p)