### 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
if (enable_shortcut.is_valid() && enable_shortcut->matches_event(p_event)) {
		set_window_enabled(true);
	}
}
void WindowWrapper::set_wrapped_control(Control *p_control, const Ref<Shortcut> &p_enable_shortcut) {
	ERR_FAIL_NULL(p_control);
	ERR_FAIL_COND(wrapped_control);
	wrapped_control = p_control;
	enable_shortcut = p_enable_shortcut;
	add_child(p_control);
}
Control *WindowWrapper::get_wrapped_control() const {