### 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)

return caret_blink_interval;
}
void LineEdit::set_caret_blink_interval(const float p_interval) {
	ERR_FAIL_COND(p_interval <= 0);
	caret_blink_interval = p_interval;
}
void LineEdit::_reset_caret_blink_timer() {
	if (caret_blink_enabled) {
		draw_caret = true;
		if (caret_can_draw) {
			caret_blink_timer = 0.0;
			queue_redraw();
		}
	}
}
void LineEdit::_toggle_draw_caret() {
	draw_caret = !draw_caret;
	if (is_visible_in_tree() && caret_can_draw) {
		queue_redraw();
	}
}
void LineEdit::_validate_caret_can_draw() {
	if (caret_blink_enabled) {
		draw_caret = true;
		caret_blink_timer = 0.0;
	}
	caret_can_draw = editable && (window_has_focus || (menu && menu->has_focus())) && (has_focus() || caret_force_displayed);
}
void LineEdit::delete_char() {