[gtksourceview] buffer: rearm timers instead of remove/add

[Christian Hergert <chergert src gnome org>]

commit b057a1e45a9a2aadb6527fe0491b0aacd41445da
Author: Christian Hergert <chergert redhat com>
Date:   Mon Aug 1 12:53:05 2022 -0700

    buffer: rearm timers instead of remove/add
    
    For things that can happen at high-velocity, it is cheaper to change the
    ready time on a GTimeoutSource than it is to remove/add a new GSource.
    
    While loading should probably disable bracket highlights altogether, this
    is a reasonable thing to have anyway for code paths that don't use helpers
    to load/unload buffer contents.
    
    Related GNOME/gnome-text-editor#444

 gtksourceview/gtksourcebuffer.c | 15 ++++++++++++---
 1 file changed, 12 insertions(+), 3 deletions(-)
---
diff --git a/gtksourceview/gtksourcebuffer.c b/gtksourceview/gtksourcebuffer.c
index dd6f6f17..ca36d846 100644
--- a/gtksourceview/gtksourcebuffer.c
+++ b/gtksourceview/gtksourcebuffer.c
@@ -112,7 +112,7 @@
  * read the no-spell-check region).
  */
 
-#define UPDATE_BRACKET_DELAY          50
+#define UPDATE_BRACKET_DELAY_MSEC     50
 #define BRACKET_MATCHING_CHARS_LIMIT  10000
 #define CONTEXT_CLASSES_PREFIX        "gtksourceview:context-classes:"
 
@@ -974,9 +974,18 @@ queue_bracket_highlighting_update (GtkSourceBuffer *buffer)
 {
        GtkSourceBufferPrivate *priv = gtk_source_buffer_get_instance_private (buffer);
 
+       /* Rearm existing GSource when possible */
        if (priv->bracket_highlighting_timeout_id != 0)
        {
-               g_source_remove (priv->bracket_highlighting_timeout_id);
+               GSource *source;
+               gint64 ready_time;
+
+               ready_time = g_get_monotonic_time () +
+                            (G_USEC_PER_SEC / 1000L) * UPDATE_BRACKET_DELAY_MSEC;
+
+               source = g_main_context_find_source_by_id (NULL, priv->bracket_highlighting_timeout_id);
+               g_source_set_ready_time (source, ready_time);
+               return;
        }
 
        /* Queue an update to the bracket location instead of doing it
@@ -998,7 +1007,7 @@ queue_bracket_highlighting_update (GtkSourceBuffer *buffer)
         */
        priv->bracket_highlighting_timeout_id =
                g_timeout_add_full (G_PRIORITY_LOW,
-                                   UPDATE_BRACKET_DELAY,
+                                   UPDATE_BRACKET_DELAY_MSEC,
                                    bracket_highlighting_timeout_cb,
                                    buffer,
                                    NULL);