Fix folder expand when dropped on itself in project_panel (#20365)

Mathias created 

Closes #13093

Release Notes:

- Fixed folder expand when dropped on itself in project_panel

Change summary

crates/project_panel/src/project_panel.rs | 4 ++++
1 file changed, 4 insertions(+)

Detailed changes

crates/project_panel/src/project_panel.rs 🔗 

@@ -1703,6 +1703,10 @@ impl ProjectPanel {
         destination_is_file: bool,
         cx: &mut ViewContext<Self>,
     ) {
+        if entry_to_move == destination {
+            return;
+        }
+
         let destination_worktree = self.project.update(cx, |project, cx| {
             let entry_path = project.path_for_entry(entry_to_move, cx)?;
             let destination_entry_path = project.path_for_entry(destination, cx)?.path.clone();