### 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.
return text[p_line].data;
}
void TextEdit::Text::_calculate_line_height() {
	int height = 0;
	for (const Line &l : text) {
		
		if (l.height == line_height) {
			height = line_height;
			break;
		}
		height = MAX(height, l.height);
	}
	line_height = height;
}
void TextEdit::Text::_calculate_max_line_width() {
	int line_width = 0;
	for (const Line &l : text) {
		if (l.hidden) {
			continue;
		}
		
		if (l.width == max_width) {
			line_width = max_width;
			break;
		}
		line_width = MAX(line_width, l.width);
	}
	max_width = line_width;
}
void TextEdit::Text::invalidate_cache(int p_line, int p_column, bool p_text_changed, const String &p_ime_text, const Array &p_bidi_override) {