### 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<int> selected_id = files->get_selected_items();
	Vector<String> selected;
	for (int i = 0; i < selected_id.size(); i++) {
		selected.push_back(files->get_item_metadata(selected_id[i]));
	}
	_file_option(p_option, selected);
}
void FileSystemDock::_file_option(int p_option, const Vector<String> &p_selected) {
	
	switch (p_option) {
		case FILE_SHOW_IN_EXPLORER: {
			
			String fpath = current_path;
			if (current_path == "Favorites") {
				fpath = p_selected[0];
			}
			String dir = ProjectSettings::get_singleton()->globalize_path(fpath);
			OS::get_singleton()->shell_show_in_file_manager(dir, true);
		} break;
		case FILE_OPEN_EXTERNAL: {
			String fpath = current_path;
			if (current_path == "Favorites") {
				fpath = p_selected[0];
			}
			String file = ProjectSettings::get_singleton()->globalize_path(fpath);
			String resource_type = ResourceLoader::get_resource_type(fpath);
			String external_program;
			if (resource_type == "CompressedTexture2D" || resource_type == "Image") {
				if (file.get_extension() == "svg" || file.get_extension() == "svgz") {
					external_program = EDITOR_GET("filesystem/external_programs/vector_image_editor");