### 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 (input_direction == TEXT_DIRECTION_LTR) {
		input_direction = TEXT_DIRECTION_RTL;
	} else {
		input_direction = TEXT_DIRECTION_LTR;
	}
	for (int i = 0; i < carets.size(); i++) {
		set_caret_column(get_caret_column(i), i == 0, i);
	}
	queue_redraw();
}
void TextEdit::_new_line(bool p_split_current_line, bool p_above) {