master 91762e4: Don't save/restore font-backend in framesets (bug#38442)

[Juanma Barranquero]

branch: master
commit 91762e49e10949a1f54a1bab78555e196e75d9ea
Author: Juanma Barranquero <address@hidden>
Commit: Juanma Barranquero <address@hidden>

    Don't save/restore font-backend in framesets (bug#38442)
    
    * lisp/frameset.el (frameset-persistent-filter-alist):
    Add :never filter for `font-backend'.
---
 lisp/frameset.el | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/lisp/frameset.el b/lisp/frameset.el
index 9a7a75f..dc59afd 100644
--- a/lisp/frameset.el
+++ b/lisp/frameset.el
@@ -456,6 +456,9 @@ DO NOT MODIFY.  See `frameset-filter-alist' for a full 
description.")
      (client                      . :never)
      (delete-before               . :never)
      (font                        . frameset-filter-font-param)
+     ;; Don't save font-backend because we cannot guarantee the new
+     ;; session will support the saved backend anyway.  (Bug#38442)
+     (font-backend                . :never)
      (foreground-color            . frameset-filter-sanitize-color)
      (frameset--text-pixel-height . :save)
      (frameset--text-pixel-width  . :save)