[libshumate] viewport: Only notify if property changed

[Corentin Noël <corentinnoel src gnome org>]

commit ba5654bc3d2ab5fd2a28f10fdb894af8bf2ebafb
Author: Georges Basile Stavracas Neto <georges stavracas gmail com>
Date:   Thu Mar 4 13:05:25 2021 -0300

    viewport: Only notify if property changed

 shumate/shumate-viewport.c | 13 ++++++++++++-
 1 file changed, 12 insertions(+), 1 deletion(-)
---
diff --git a/shumate/shumate-viewport.c b/shumate/shumate-viewport.c
index 894e871..9eb3b43 100644
--- a/shumate/shumate-viewport.c
+++ b/shumate/shumate-viewport.c
@@ -302,7 +302,12 @@ shumate_viewport_set_zoom_level (ShumateViewport *self,
 {
   g_return_if_fail (SHUMATE_IS_VIEWPORT (self));
 
-  self->zoom_level = CLAMP (zoom_level, self->min_zoom_level, self->max_zoom_level);
+  zoom_level = CLAMP (zoom_level, self->min_zoom_level, self->max_zoom_level);
+
+  if (self->zoom_level == zoom_level)
+    return;
+
+  self->zoom_level = zoom_level;
   g_object_notify_by_pspec (G_OBJECT (self), obj_properties[PROP_ZOOM_LEVEL]);
 }
 
@@ -335,6 +340,9 @@ shumate_viewport_set_max_zoom_level (ShumateViewport *self,
 {
   g_return_if_fail (SHUMATE_IS_VIEWPORT (self));
 
+  if (self->max_zoom_level == max_zoom_level)
+    return;
+
   if (self->zoom_level > max_zoom_level)
     shumate_viewport_set_zoom_level (self, max_zoom_level);
   
@@ -371,6 +379,9 @@ shumate_viewport_set_min_zoom_level (ShumateViewport *self,
 {
   g_return_if_fail (SHUMATE_IS_VIEWPORT (self));
 
+  if (self->min_zoom_level == min_zoom_level)
+    return;
+
   if (self->zoom_level > min_zoom_level)
     shumate_viewport_set_zoom_level (self, min_zoom_level);