### 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
tree->clear();
	tree_update_id++;
	updating_tree = true;
	TreeItem *root = tree->create_item();
	
	TreeItem *favorites_item = tree->create_item(root);
	favorites_item->set_icon(0, get_theme_icon(SNAME("Favorites"), SNAME("EditorIcons")));
	favorites_item->set_text(0, TTR("Favorites:"));
	favorites_item->set_metadata(0, "Favorites");
	favorites_item->set_collapsed(p_uncollapsed_paths.find("Favorites") < 0);
	Vector<String> favorite_paths = EditorSettings::get_singleton()->get_favorites();
	Ref<DirAccess> da = DirAccess::create(DirAccess::ACCESS_RESOURCES);
	bool fav_changed = false;
	for (int i = favorite_paths.size() - 1; i >= 0; i--) {
		if (da->dir_exists(favorite_paths[i]) || da->file_exists(favorite_paths[i])) {
			continue;
		}
		favorite_paths.remove_at(i);
		fav_changed = true;
	}
	if (fav_changed) {
		EditorSettings::get_singleton()->set_favorites(favorite_paths);
	}
	for (int i = 0; i < favorite_paths.size(); i++) {
		String favorite = favorite_paths[i];
		if (!favorite.begins_with("res://")) {