### 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_V(p_line, text.size(), 0);
	p_wrap_index = MIN(p_wrap_index, text.get_line_data(p_line)->get_line_count() - 1);
	RID text_rid = text.get_line_data(p_line)->get_line_rid(p_wrap_index);
	if (is_layout_rtl()) {
		p_px = TS->shaped_text_get_size(text_rid).x - p_px;
	}
	return TS->shaped_text_hit_test_position(text_rid, p_px);
}
void TextEdit::_emit_caret_changed() {
	emit_signal(SNAME("caret_changed"));
	caret_pos_dirty = false;
	caret_index_edit_dirty = true;
}
void TextEdit::_reset_caret_blink_timer() {
	if (!caret_blink_enabled) {
		return;
	}
	draw_caret = true;
	if (has_focus()) {
		caret_blink_timer->stop();
		caret_blink_timer->start();
		queue_redraw();
	}
}
void TextEdit::_toggle_draw_caret() {