[gnome-builder/wip/gtk4-port] plugins/project-tree: add missing bits for positioning

[Christian Hergert <chergert src gnome org>]

commit 7e101f1950627ba0c913107d5fb7e6aace7a9c6f
Author: Christian Hergert <chergert redhat com>
Date:   Thu Mar 31 02:32:34 2022 -0700

    plugins/project-tree: add missing bits for positioning

 src/plugins/project-tree/gbp-project-tree-workspace-addin.c | 3 +--
 1 file changed, 1 insertion(+), 2 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 374d4d6ef..be08cd030 100644
--- a/src/plugins/project-tree/gbp-project-tree-workspace-addin.c
+++ b/src/plugins/project-tree/gbp-project-tree-workspace-addin.c
@@ -39,8 +39,7 @@ gbp_project_tree_workspace_addin_load (IdeWorkspaceAddin *addin,
                                        IdeWorkspace      *workspace)
 {
   GbpProjectTreeWorkspaceAddin *self = (GbpProjectTreeWorkspaceAddin *)addin;
-  IdeEditorSidebar *sidebar;
-  IdeSurface *surface;
+  g_autoptr(IdePanelPosition) position = NULL;
 
   g_assert (GBP_IS_PROJECT_TREE_WORKSPACE_ADDIN (self));
   g_assert (IDE_IS_WORKSPACE (workspace));