### 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.
} else {
		TS->shaped_text_set_direction(text_rid, (TextServer::Direction)text_direction);
	}
	TS->shaped_text_set_preserve_control(text_rid, draw_control_chars);
	TS->shaped_text_add_string(text_rid, t, font->get_rids(), font_size, font->get_opentype_features(), language);
	for (int i = 0; i < TextServer::SPACING_MAX; i++) {
		TS->shaped_text_set_spacing(text_rid, TextServer::SpacingType(i), font->get_spacing(TextServer::SpacingType(i)));
	}
	TS->shaped_text_set_bidi_override(text_rid, structured_text_parser(st_parser, st_args, t));
	full_width = TS->shaped_text_get_size(text_rid).x;
	_fit_to_width();
	Size2 size = TS->shaped_text_get_size(text_rid);
	if ((expand_to_text_length && old_size.x != size.x) || (old_size.y != size.y)) {
		update_minimum_size();
	}
}
void LineEdit::_fit_to_width() {
	if (alignment == HORIZONTAL_ALIGNMENT_FILL) {
		Ref<StyleBox> style = theme_cache.normal;
		int t_width = get_size().width - style->get_margin(SIDE_RIGHT) - style->get_margin(SIDE_LEFT);
		bool using_placeholder = text.is_empty() && ime_text.is_empty();
		bool display_clear_icon = !using_placeholder && is_editable() && clear_button_enabled;
		if (right_icon.is_valid() || display_clear_icon) {
			Ref<Texture2D> r_icon = display_clear_icon ? theme_cache.clear_icon : right_icon;
			t_width -= r_icon->get_width();
		}
		TS->shaped_text_fit_to_width(text_rid, MAX(t_width, full_width));
	}
}
void LineEdit::_clear_redo() {