### Godot version

4.0 beta 15

### System information

Windows 10

### Issue description

It happened with both Google IME and MS-IME, and there was no problem until Beta14.
When typing Japanese characters, it is common to select a character from the suggestion window and then start typing the next character before confirming.
In this case, uncommitted characters are forcibly committed, and input of the next character begins.

**↓Beta15**

https://user-images.githubusercontent.com/186786/214753450-b493cca6-2644-4b3d-8cd2-660565cc3547.mp4

**↓Beta14**

https://user-images.githubusercontent.com/186786/214755127-dde819cc-4d63-403a-99b0-09821671f74e.mp4



### Steps to reproduce

It happened with both Google IME and MS-IME in beta15

### Minimal reproduction project

It is project independent and happens in the editor.
ERR_FAIL_INDEX((int)p_alignment, 4);
	if (alignment == p_alignment) {
		return;
	}
	alignment = p_alignment;
	_shape();
	queue_redraw();
}
HorizontalAlignment LineEdit::get_horizontal_alignment() const {
	return alignment;
}
Variant LineEdit::get_drag_data(const Point2 &p_point) {
	if (selection.drag_attempt && selection.enabled) {
		String t = text.substr(selection.begin, selection.end - selection.begin);
		Label *l = memnew(Label);
		l->set_text(t);
		set_drag_preview(l);
		return t;
	}
	return Variant();
}
bool LineEdit::can_drop_data(const Point2 &p_point, const Variant &p_data) const {
	bool drop_override = Control::can_drop_data(p_point, p_data); 
	if (drop_override) {
		return drop_override;
	}
	return is_editable() && p_data.get_type() == Variant::STRING;
}
void LineEdit::drop_data(const Point2 &p_point, const Variant &p_data) {