[Emacs-diffs] emacs-26 2da83c9: Avoid assertion violations when line numbers are displayed

[Eli Zaretskii]

branch: emacs-26
commit 2da83c9d3630702ed10f54e890709d1afdb6585f
Author: Eli Zaretskii <address@hidden>
Commit: Eli Zaretskii <address@hidden>

    Avoid assertion violations when line numbers are displayed
    
    * src/xdisp.c (redisplay_window): Clear the window's desired glyph
    matrix before calling try_window with the same starting     point.
    This avoids assertion violations when switching from a buffer
    without line numbers to a buffer with line numbers.  (Bug28710)
---
 src/xdisp.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/src/xdisp.c b/src/xdisp.c
index 141275f..b14b7da 100644
--- a/src/xdisp.c
+++ b/src/xdisp.c
@@ -17036,6 +17036,7 @@ redisplay_window (Lisp_Object window, bool 
just_this_one_p)
               = try_window_reusing_current_matrix (w)))
        {
          IF_DEBUG (debug_method_add (w, "1"));
+         clear_glyph_matrix (w->desired_matrix);
          if (try_window (window, startp, TRY_WINDOW_CHECK_MARGINS) < 0)
            /* -1 means we need to scroll.
               0 means we need new matrices, but fonts_changed