### 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.
if (right_icon == p_icon) {
		return;
	}
	right_icon = p_icon;
	_fit_to_width();
	update_minimum_size();
	queue_redraw();
}
Ref<Texture2D> LineEdit::get_right_icon() {
	return right_icon;
}
void LineEdit::set_flat(bool p_enabled) {
	if (flat != p_enabled) {
		flat = p_enabled;
		queue_redraw();
	}
}
bool LineEdit::is_flat() const {
	return flat;
}
void LineEdit::set_select_all_on_focus(bool p_enabled) {
	select_all_on_focus = p_enabled;
}
bool LineEdit::is_select_all_on_focus() const {
	return select_all_on_focus;
}
void LineEdit::clear_pending_select_all_on_focus() {
	pending_select_all_on_focus = false;
}
void LineEdit::_text_changed() {