Allow to disable compaction of font caches

* src/font.c (syms_of_font) <inhibit-compacting-font-caches>: New
boolean variable.
* src/alloc.c (compact_font_caches): Use it to bypass the call to
compact_font_cache_entry.  (Bug#24634)  (Bug#24565)

* etc/NEWS: Mention the new variable.

1 files changed, 5 insertions, 1 deletions

diff --git a/src/alloc.c b/src/alloc.c
index f33d93f83b4..c7f58a8adc4 100644
--- a/src/alloc.c
+++ b/src/alloc.c
@@ -5584,7 +5584,11 @@ compact_font_caches (void)
   for (t = terminal_list; t; t = t->next_terminal)
     {
       Lisp_Object cache = TERMINAL_FONT_CACHE (t);
-      if (CONSP (cache))
+      /* Inhibit compacting the caches if the user so wishes.  Some of
+         the users don't mind a larger memory footprint, but do mind
+         slower redisplay.  */
+      if (!inhibit_compacting_font_caches
+          && CONSP (cache))
         {
           Lisp_Object entry;