### 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
path = path.substr(6);
				}
				path = path.get_basename();
				
				scene_name = scene_name.trim_suffix("/");
				path = path.trim_suffix("/");
				
				
				
				can_proceed = can_proceed || (path.size() - scene_name.size()) >= 1;
				E = E->next();
				if (to_erase) {
					iset.erase(to_erase);
				}
			}
			if (!can_proceed) {
				break;
			}
		}
	}
}
void EditorNode::_update_scene_tabs() {
	bool show_rb = EDITOR_GET("interface/scene_tabs/show_script_button");
	if (DisplayServer::get_singleton()->has_feature(DisplayServer::FEATURE_GLOBAL_MENU)) {
		DisplayServer::get_singleton()->global_menu_clear("_dock");
	}
	
	Vector<String> disambiguated_scene_names;
	Vector<String> full_path_names;
	for (int i = 0; i < editor_data.get_edited_scene_count(); i++) {