### 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 (p_from_line == p_to_line) {
		return;
	}
	bool dirty_height = false;
	bool dirty_width = false;
	for (int i = p_from_line; i < p_to_line; i++) {
		if (!dirty_height && text[i].height == line_height) {
			dirty_height = true;
		}
		if (!dirty_width && text[i].width == max_width) {
			dirty_width = true;
		}
		if (dirty_height && dirty_width) {
			break;
		}
	}
	int diff = (p_to_line - p_from_line);
	for (int i = p_to_line; i < text.size() - 1; i++) {
		text.write[(i - diff) + 1] = text[i + 1];
	}
	text.resize(text.size() - diff);
	if (dirty_height) {
		_calculate_line_height();
	}
	if (dirty_width) {
		_calculate_max_line_width();
	}
}
void TextEdit::Text::add_gutter(int p_at) {