### Godot version

v4.2.dev.custom_build [0c2144da9]

### System information

Debian Linux X11 Xfce

### Issue description

Prerequisite: Be in Single Window Mode in the Editor
The Filesystem Dock is unusable when it is floating, which is not expected.
It appears garbled in the top-left corner:
![image](https://github.com/godotengine/godot/assets/6299227/109f7922-97de-44c3-814a-ca7f970e0602)

The following errors are shown:
```
  editor/window_wrapper.cpp:220 - Condition "!is_window_available()" is true.
  editor/window_wrapper.cpp:202 - Condition "!get_window_enabled()" is true. Returning: Rect2i()
  editor/window_wrapper.cpp:207 - Condition "!get_window_enabled()" is true. Returning: -1
  editor/window_wrapper.cpp:207 - Condition "!get_window_enabled()" is true. Returning: -1
```

bisecting lead to #62378
possibly related to #44439

### Steps to reproduce

1. Start a project in the Editor
2. Switch to Single Window Mode in the Editor and reload (if necessary)
3. Make the Filesystem Dock floating

### Minimal reproduction project

Editor issue
}
			Ref<ConfigFile> config;
			config.instantiate();
			Error err = config->load(EditorSettings::get_singleton()->get_editor_layouts_config());
			if (err != OK || !config->has_section(p_file)) {
				show_warning(TTR("Layout name not found!"));
				return;
			}
			
			List<String> keys;
			config->get_section_keys(p_file, &keys);
			for (const String &key : keys) {
				config->set_value(p_file, key, Variant());
			}
			config->save(EditorSettings::get_singleton()->get_editor_layouts_config());
			layout_dialog->hide();
			_update_layouts_menu();
			if (p_file == "Default") {
				show_warning(TTR("Restored the Default layout to its base settings."));
			}
		} break;
		default: {
			
			if (file->get_file_mode() == EditorFileDialog::FILE_MODE_SAVE_FILE) {
				_save_scene_with_preview(p_file);
			}
		} break;
	}
}
bool EditorNode::_is_class_editor_disabled_by_feature_profile(const StringName &p_class) {