### 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> reimport;
			for (int i = 0; i < p_selected.size(); i++) {
				reimport.push_back(p_selected[i]);
			}
			ERR_FAIL_COND_MSG(reimport.size() == 0, "You need to select files to reimport them.");
		} break;
		case FILE_NEW_FOLDER: {
			String directory = current_path;
			if (!directory.ends_with("/")) {
				directory = directory.get_base_dir();
			}
			make_dir_dialog->config(directory);
			make_dir_dialog->popup_centered();
		} break;
		case FILE_NEW_SCENE: {
			String directory = current_path;
			if (!directory.ends_with("/")) {
				directory = directory.get_base_dir();
			}
			make_scene_dialog->config(directory);
			make_scene_dialog->popup_centered();
		} break;
		case FILE_NEW_SCRIPT: {
			String fpath = current_path;
			if (!fpath.ends_with("/")) {
				fpath = fpath.get_base_dir();
			}
			make_script_dialog->config("Node", fpath.path_join("new_script.gd"), false, false);
			make_script_dialog->popup_centered();