### 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 tab_size;
}
void TextEdit::Text::set_direction_and_language(TextServer::Direction p_direction, const String &p_language) {
	if (direction == p_direction && language == p_language) {
		return;
	}
	direction = p_direction;
	language = p_language;
	is_dirty = true;
}
void TextEdit::Text::set_draw_control_chars(bool p_enabled) {
	if (draw_control_chars == p_enabled) {
		return;
	}
	draw_control_chars = p_enabled;
	is_dirty = true;
}
int TextEdit::Text::get_line_width(int p_line, int p_wrap_index) const {
	ERR_FAIL_INDEX_V(p_line, text.size(), 0);
	if (p_wrap_index != -1) {
		return text[p_line].data_buf->get_line_width(p_wrap_index);
	}
	return text[p_line].data_buf->get_size().x;
}
int TextEdit::Text::get_line_height() const {