### 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
file_item->set_metadata(0, file_metadata);
			if (!p_select_in_favorites && current_path == file_metadata) {
				file_item->select(0);
				file_item->set_as_cursor(0);
			}
			if (main_scene == file_metadata) {
				file_item->set_custom_color(0, get_theme_color(SNAME("accent_color"), SNAME("Editor")));
			}
			Array udata;
			udata.push_back(tree_update_id);
			udata.push_back(file_item);
			EditorResourcePreview::get_singleton()->queue_resource_preview(file_metadata, this, "_tree_thumbnail_done", udata);
		}
	} else if (display_mode == DISPLAY_MODE_SPLIT) {
		if (lpath.get_base_dir() == current_path.get_base_dir()) {
			subdirectory_item->select(0);
			subdirectory_item->set_as_cursor(0);
		}
	}
	if (searched_string.length() > 0) {
		if (parent_should_expand) {
			subdirectory_item->set_collapsed(false);
		} else if (dname != "res://") {
			subdirectory_item->get_parent()->remove_child(subdirectory_item);
			memdelete(subdirectory_item);
		}
	}
	return parent_should_expand;
}
Vector<String> FileSystemDock::get_uncollapsed_paths() const {