### Godot version

4.1 db5113d

### System information

Windows 10.0.19045 - Vulkan (Forward+) - dedicated NVIDIA GeForce GTX 1060 (NVIDIA; 30.0.15.1403) - Intel(R) Core(TM) i7-7700HQ CPU @ 2.80GHz (8 Threads)

### Issue description

![image](https://github.com/godotengine/godot/assets/2223172/ee391a0d-44b7-4a35-bfa5-40d47af75f65)
Notice the empty space to the right. I actually have a worse case in my project, but I couldn't reproduce it outside:
![](https://chat.godotengine.org/file-upload/X3RMM5A9gN7RZEizo/Clipboard%20-%202%20czerwca%202023%2022:54)
Regression from #77651
CC @Rindbee 

### Steps to reproduce

1. Add a new script
2. Name it `;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;.gd`
3. Hover its name in the Script Editor

### Minimal reproduction project

N/A
ERR_READ_THREAD_GUARD_V(false);
	return data.theme_owner->has_owner_node();
}
void Control::set_theme(const Ref<Theme> &p_theme) {
	ERR_MAIN_THREAD_GUARD;
	if (data.theme == p_theme) {
		return;
	}
	if (data.theme.is_valid()) {
		data.theme->disconnect("changed", callable_mp(this, &Control::_theme_changed));
	}
	data.theme = p_theme;
	if (data.theme.is_valid()) {
		data.theme_owner->propagate_theme_changed(this, this, is_inside_tree(), true);
		data.theme->connect("changed", callable_mp(this, &Control::_theme_changed), CONNECT_DEFERRED);
		return;
	}
	Control *parent_c = Object::cast_to<Control>(get_parent());
	if (parent_c && parent_c->has_theme_owner_node()) {
		data.theme_owner->propagate_theme_changed(this, parent_c->get_theme_owner_node(), is_inside_tree(), true);
		return;
	}
	Window *parent_w = cast_to<Window>(get_parent());
	if (parent_w && parent_w->has_theme_owner_node()) {
		data.theme_owner->propagate_theme_changed(this, parent_w->get_theme_owner_node(), is_inside_tree(), true);
		return;
	}
	data.theme_owner->propagate_theme_changed(this, nullptr, is_inside_tree(), true);
}
Ref<Theme> Control::get_theme() const {