### Godot version

v4.1.rc2.official [46424488e]

### System information

Godot v4.1.rc2 - Linux Mint 20 (Ulyana) - Vulkan (Forward+) - dedicated NVIDIA GeForce RTX 2060 SUPER (nvidia; 515.105.01) - Intel(R) Core(TM) i7-6700K CPU @ 4.00GHz (8 Threads)

### Issue description

Dragging and dropping a file to a new position inside its current folder, or onto the icon for its current folder - when that folder is the project root folder :res// - will be treated as though you were dropping a different file with the same name.

Expectation: for nothing to happen.

Also tried it in 4.0.3 and 4.1-dev3, where it behaves as expected.

https://github.com/godotengine/godot/assets/64640811/90de1120-dd92-41b8-b202-db77c343103a

### Steps to reproduce

1. New or existing project.
2. Click and drag a file in :res// in FileSystem dock.
3. Drop the file back into :res//.
4. Be prompted to overwrite or rename.

### Minimal reproduction project

N/A
Vector<String> uncollapsed_paths;
	TreeItem *root = tree->get_root();
	if (root) {
		TreeItem *favorites_item = root->get_first_child();
		if (!favorites_item->is_collapsed()) {
			uncollapsed_paths.push_back(favorites_item->get_metadata(0));
		}
		
		TreeItem *res_subtree = root->get_first_child()->get_next();
		if (res_subtree) {
			List<TreeItem *> queue;
			queue.push_back(res_subtree);
			while (!queue.is_empty()) {
				TreeItem *ti = queue.back()->get();
				queue.pop_back();
				if (!ti->is_collapsed() && ti->get_child_count() > 0) {
					Variant path = ti->get_metadata(0);
					if (path) {
						uncollapsed_paths.push_back(path);
					}
				}
				for (int i = 0; i < ti->get_child_count(); i++) {
					queue.push_back(ti->get_child(i));
				}
			}
		}
	}
	return uncollapsed_paths;
}
void FileSystemDock::_update_tree(const Vector<String> &p_uncollapsed_paths, bool p_uncollapse_root, bool p_select_in_favorites, bool p_unfold_path) {