### 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_MAIN_THREAD_GUARD;
	ERR_FAIL_COND(!p_style.is_valid());
	if (data.theme_style_override.has(p_name)) {
		data.theme_style_override[p_name]->disconnect("changed", callable_mp(this, &Control::_notify_theme_override_changed));
	}
	data.theme_style_override[p_name] = p_style;
	data.theme_style_override[p_name]->connect("changed", callable_mp(this, &Control::_notify_theme_override_changed), CONNECT_REFERENCE_COUNTED);
	_notify_theme_override_changed();
}
void Control::add_theme_font_override(const StringName &p_name, const Ref<Font> &p_font) {
	ERR_MAIN_THREAD_GUARD;
	ERR_FAIL_COND(!p_font.is_valid());
	if (data.theme_font_override.has(p_name)) {
		data.theme_font_override[p_name]->disconnect("changed", callable_mp(this, &Control::_notify_theme_override_changed));
	}
	data.theme_font_override[p_name] = p_font;
	data.theme_font_override[p_name]->connect("changed", callable_mp(this, &Control::_notify_theme_override_changed), CONNECT_REFERENCE_COUNTED);
	_notify_theme_override_changed();
}
void Control::add_theme_font_size_override(const StringName &p_name, int p_font_size) {
	ERR_MAIN_THREAD_GUARD;
	data.theme_font_size_override[p_name] = p_font_size;
	_notify_theme_override_changed();
}
void Control::add_theme_color_override(const StringName &p_name, const Color &p_color) {