[gnome-builder/wip/gtk4-port] plugins/project-tree: use pane helpers

[Christian Hergert <chergert src gnome org>]

commit 59a0d410745eb392010ffba73a23d49ea1ddb739
Author: Christian Hergert <chergert redhat com>
Date:   Mon Apr 18 06:10:51 2022 -0700

    plugins/project-tree: use pane helpers

 src/plugins/project-tree/gbp-project-tree-workspace-addin.c | 11 ++++++-----
 1 file changed, 6 insertions(+), 5 deletions(-)
---
diff --git a/src/plugins/project-tree/gbp-project-tree-workspace-addin.c 
b/src/plugins/project-tree/gbp-project-tree-workspace-addin.c
index 1672f0662..0aabc1473 100644
--- a/src/plugins/project-tree/gbp-project-tree-workspace-addin.c
+++ b/src/plugins/project-tree/gbp-project-tree-workspace-addin.c
@@ -44,10 +44,11 @@ gbp_project_tree_workspace_addin_load (IdeWorkspaceAddin *addin,
   g_assert (GBP_IS_PROJECT_TREE_WORKSPACE_ADDIN (self));
   g_assert (IDE_IS_WORKSPACE (workspace));
 
-  self->pane = g_object_new (GBP_TYPE_PROJECT_TREE_PANE,
-                             "title", _("Project Tree"),
-                             "icon-name", "view-list-symbolic",
-                             NULL);
+  ide_pane_observe (g_object_new (GBP_TYPE_PROJECT_TREE_PANE,
+                                  "title", _("Project Tree"),
+                                  "icon-name", "view-list-symbolic",
+                                  NULL),
+                    (IdePane **)&self->pane);
 
   position = ide_panel_position_new ();
   ide_panel_position_set_edge (position, PANEL_DOCK_POSITION_START);
@@ -66,7 +67,7 @@ gbp_project_tree_workspace_addin_unload (IdeWorkspaceAddin *addin,
   g_assert (GBP_IS_PROJECT_TREE_WORKSPACE_ADDIN (self));
   g_assert (IDE_IS_WORKSPACE (workspace));
 
-  g_clear_pointer ((IdePane **)&self->pane, ide_pane_destroy);
+  ide_clear_pane ((IdePane **)&self->pane);
 }
 
 static void