### 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
if (!paths.is_empty()) {
				emit_signal(SNAME("instantiate"), paths);
			}
		} break;
		case FILE_ADD_FAVORITE: {
			
			Vector<String> favorites_list = EditorSettings::get_singleton()->get_favorites();
			for (int i = 0; i < p_selected.size(); i++) {
				if (!favorites_list.has(p_selected[i])) {
					favorites_list.push_back(p_selected[i]);
				}
			}
			EditorSettings::get_singleton()->set_favorites(favorites_list);
			_update_tree(get_uncollapsed_paths());
		} break;
		case FILE_REMOVE_FAVORITE: {
			
			Vector<String> favorites_list = EditorSettings::get_singleton()->get_favorites();
			for (int i = 0; i < p_selected.size(); i++) {
				favorites_list.erase(p_selected[i]);
			}
			EditorSettings::get_singleton()->set_favorites(favorites_list);
			_update_tree(get_uncollapsed_paths());
			if (current_path == "Favorites") {
				_update_file_list(true);
			}
		} break;
		case FILE_DEPENDENCIES: {
			
			if (!p_selected.is_empty()) {