2 files changed, 14 insertions, 5 deletions

diff --git a/src/timefns.c b/src/timefns.c
index b3132e7bc34..87971cf4563 100644
--- a/src/timefns.c
+++ b/src/timefns.c
@@ -180,6 +180,15 @@ static timezone_t const utc_tz = 0;
 static struct tm *
 emacs_localtime_rz (timezone_t tz, time_t const *t, struct tm *tm)
 {
+#ifdef WINDOWSNT
+  /* The Windows CRT functions are "optimized for speed", so they don't
+     check for timezone and DST changes if they were last called less
+     than 1 minute ago (see http://support.microsoft.com/kb/821231).
+     So all Emacs features that repeatedly call time functions (e.g.,
+     display-time) are in real danger of missing timezone and DST
+     changes.  Calling tzset before each localtime call fixes that.  */
+  tzset ();
+#endif
   tm = localtime_rz (tz, t, tm);
   if (!tm && errno == ENOMEM)
     memory_full (SIZE_MAX);
diff --git a/src/treesit.c b/src/treesit.c
index 36a297ec7da..fd5fda78133 100644
--- a/src/treesit.c
+++ b/src/treesit.c
@@ -1016,11 +1016,6 @@ treesit_call_after_change_functions (TSTree *old_tree, TSTree *new_tree,
 static void
 treesit_ensure_parsed (Lisp_Object parser)
 {
-  /* Make sure this comes before everything else, see comment
-     (ref:notifier-inside-ensure-parsed) for more detail.  */
-  if (!XTS_PARSER (parser)->need_reparse)
-    return;
-
   struct buffer *buffer = XBUFFER (XTS_PARSER (parser)->buffer);
 
   /* Before we parse, catch up with the narrowing situation.  */
@@ -1029,6 +1024,11 @@ treesit_ensure_parsed (Lisp_Object parser)
      because it might set the flag to true.  */
   treesit_sync_visible_region (parser);
 
+  /* Make sure this comes before everything else, see comment
+     (ref:notifier-inside-ensure-parsed) for more detail.  */
+  if (!XTS_PARSER (parser)->need_reparse)
+    return;
+
   TSParser *treesit_parser = XTS_PARSER (parser)->parser;
   TSTree *tree = XTS_PARSER (parser)->tree;
   TSInput input = XTS_PARSER (parser)->input;