### Godot version

4.0.2.stable.official [7a0977ce2]

### System information

Windows 10

### Issue description

LineEdit node with enabled "expand_to_text_length" option and "minimum_character_width = 0" and cleared margins in style overrides still has some empty space inside
![node](https://github.com/godotengine/godot/assets/23380802/86c79678-8422-4a98-8406-602edd7dc48b)
![node settings](https://github.com/godotengine/godot/assets/23380802/11d04d71-bbf1-4c16-8155-fe39b5bbd66b)
![style overrides](https://github.com/godotengine/godot/assets/23380802/6b3c3925-b4bd-455b-aac1-ddeb54a4d796)


### Steps to reproduce

1. Add LineEdit node
2. Set expand_to_text_length = true
3. Set minimum_character_width in theme overrides = 0
4. Set normal to StyleBoxEmpty


### Minimal reproduction project

[LineEdit can't be zero sized.zip](https://github.com/godotengine/godot/files/11566017/LineEdit.can.t.be.zero.sized.zip)

if (undo_stack_pos == nullptr) {
		return undo_stack.size() > 1;
	}
	return undo_stack_pos != undo_stack.front();
}
bool LineEdit::has_redo() const {
	return undo_stack_pos != nullptr && undo_stack_pos != undo_stack.back();
}
void LineEdit::undo() {
	if (!editable) {
		return;
	}
	if (undo_stack_pos == nullptr) {
		if (undo_stack.size() <= 1) {
			return;
		}
		undo_stack_pos = undo_stack.back();
	} else if (undo_stack_pos == undo_stack.front()) {
		return;
	}
	deselect();
	undo_stack_pos = undo_stack_pos->prev();
	TextOperation op = undo_stack_pos->get();
	text = op.text;
	scroll_offset = op.scroll_offset;
	set_caret_column(op.caret_column);
	_shape();
	_emit_text_change();
}
void LineEdit::redo() {