[gnome-builder] gui: invalidate pipeline when branch changes

[Christian Hergert <chergert src gnome org>]

commit 42be913b3382953e389556b309b72fe40d3fd4ac
Author: Christian Hergert <chergert redhat com>
Date:   Tue Aug 3 16:12:18 2021 -0700

    gui: invalidate pipeline when branch changes

 src/libide/gui/ide-workbench.c | 27 +++++++++++++++++++++++++++
 1 file changed, 27 insertions(+)
---
diff --git a/src/libide/gui/ide-workbench.c b/src/libide/gui/ide-workbench.c
index 877b9ee06..ae447f323 100644
--- a/src/libide/gui/ide-workbench.c
+++ b/src/libide/gui/ide-workbench.c
@@ -2220,6 +2220,27 @@ remove_non_matching_vcs_cb (IdeObject *child,
     ide_object_destroy (child);
 }
 
+static void
+ide_workbench_vcs_notify_branch_name_cb (IdeWorkbench *self,
+                                         GParamSpec   *pspec,
+                                         IdeVcs       *vcs)
+{
+  IdeBuildManager *build_manager;
+
+  IDE_ENTRY;
+
+  g_assert (IDE_IS_WORKBENCH (self));
+  g_assert (IDE_IS_VCS (vcs));
+
+  if (!ide_workbench_has_project (self))
+    IDE_EXIT;
+
+  build_manager = ide_build_manager_from_context (self->context);
+  ide_build_manager_invalidate (build_manager);
+
+  IDE_EXIT;
+}
+
 /**
  * ide_workbench_set_vcs:
  * @self: a #IdeWorkbench
@@ -2265,6 +2286,12 @@ ide_workbench_set_vcs (IdeWorkbench *self,
                               ide_workbench_propagate_vcs_cb,
                               self->vcs);
 
+  g_signal_connect_object (vcs,
+                           "notify::branch-name",
+                           G_CALLBACK (ide_workbench_vcs_notify_branch_name_cb),
+                           self,
+                           G_CONNECT_SWAPPED);
+
   g_object_notify_by_pspec (G_OBJECT (self), properties [PROP_VCS]);
 }