### 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 line_height;
}
void TextEdit::Text::set_width(float p_width) {
	width = p_width;
}
float TextEdit::Text::get_width() const {
	return width;
}
int TextEdit::Text::get_line_wrap_amount(int p_line) const {
	ERR_FAIL_INDEX_V(p_line, text.size(), 0);
	return text[p_line].data_buf->get_line_count() - 1;
}
Vector<Vector2i> TextEdit::Text::get_line_wrap_ranges(int p_line) const {
	Vector<Vector2i> ret;
	ERR_FAIL_INDEX_V(p_line, text.size(), ret);
	for (int i = 0; i < text[p_line].data_buf->get_line_count(); i++) {
		ret.push_back(text[p_line].data_buf->get_line_range(i));
	}
	return ret;
}
const Ref<TextParagraph> TextEdit::Text::get_line_data(int p_line) const {
	ERR_FAIL_INDEX_V(p_line, text.size(), Ref<TextParagraph>());
	return text[p_line].data_buf;
}
_FORCE_INLINE_ const String &TextEdit::Text::operator[](int p_line) const {