Make face realization be more frame-specific

* src/frame.h (struct f): New flag face_change.
* src/xfaces.c (Finternal_make_lisp_face)
(Finternal_copy_lisp_face, Finternal_set_lisp_face_attribute)
(update_face_from_frame_parameter): Set the face_change flag only
for the frame whose faces are affected.
* src/xdisp.c (init_iterator): If a frame's face_change flag is
set, free faces only on that frame.
(redisplay_internal): Disable "display optimization 1" if the
frame's face_change flag is set.
(redisplay_window): Don't allow skipping a window's redisplay if
its frame's face_change flag is set.
* src/frame.c (x_set_screen_gamma): Instead of calling
Fclear_face_cache, call clear_face_cache and set
windows_or_buffers_changed to a non-zero value.  This avoids
setting the global face_change flag that triggers face realization
on all frames and thorough redisplay of all of them.

* lisp/term/tty-colors.el (tty-register-default-colors): Don't
clear face cache if the selected frame is a GUI frame.

1 files changed, 5 insertions, 3 deletions

diff --git a/lisp/term/tty-colors.el b/lisp/term/tty-colors.el
index 98108ce6356..3bc1aa0ee48 100644
--- a/lisp/term/tty-colors.el
+++ b/lisp/term/tty-colors.el
@@ -810,9 +810,11 @@ Value is the modified color alist for FRAME."
     (while colors
       (tty-color-define (car color) (cadr color) (cddr color))
       (setq colors (cdr colors) color (car colors)))
-    ;; Modifying color mappings means realized faces don't
-    ;; use the right colors, so clear them.
-    (clear-face-cache)))
+    ;; Modifying color mappings means realized faces don't use the
+    ;; right colors, so clear them, if we modified colors on a TTY
+    ;; frame.
+    (or (display-graphic-p)
+        (clear-face-cache))))
 
 (defun tty-color-canonicalize (color)
   "Return COLOR in canonical form.