[gnome-builder] buildmanager: avoid spurious emissions of can-build

[Christian Hergert <chergert src gnome org>]

commit 2b918205bef8517c4472ced177a7268839a967e8
Author: Christian Hergert <chergert redhat com>
Date:   Tue Apr 18 14:53:44 2017 -0700

    buildmanager: avoid spurious emissions of can-build

 libide/buildsystem/ide-build-manager.c |   18 ++++++++++++------
 1 files changed, 12 insertions(+), 6 deletions(-)
---
diff --git a/libide/buildsystem/ide-build-manager.c b/libide/buildsystem/ide-build-manager.c
index d15c7d7..93cdc11 100644
--- a/libide/buildsystem/ide-build-manager.c
+++ b/libide/buildsystem/ide-build-manager.c
@@ -50,9 +50,10 @@ struct _IdeBuildManager
   guint             can_build : 1;
 };
 
-static void initable_iface_init     (GInitableIface *);
-static void action_group_iface_init (GActionGroupInterface *);
-static void ide_build_manager_set_can_build (IdeBuildManager *self, gboolean can_build);
+static void initable_iface_init             (GInitableIface        *iface);
+static void action_group_iface_init         (GActionGroupInterface *iface);
+static void ide_build_manager_set_can_build (IdeBuildManager       *self,
+                                             gboolean               can_build);
 
 G_DEFINE_TYPE_EXTENDED (IdeBuildManager, ide_build_manager, IDE_TYPE_OBJECT, 0,
                         G_IMPLEMENT_INTERFACE (G_TYPE_INITABLE, initable_iface_init)
@@ -1423,7 +1424,12 @@ ide_build_manager_set_can_build (IdeBuildManager *self,
 {
   g_return_if_fail (IDE_IS_BUILD_MANAGER (self));
 
-  self->can_build = !!can_build;
-  g_object_notify_by_pspec (G_OBJECT (self), properties [PROP_CAN_BUILD]);
-  ide_build_manager_update_action_enabled (self);
+  can_build = !!can_build;
+
+  if (self->can_build != can_build)
+    {
+      self->can_build = can_build;
+      g_object_notify_by_pspec (G_OBJECT (self), properties [PROP_CAN_BUILD]);
+      ide_build_manager_update_action_enabled (self);
+    }
 }