### 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.
ERR_FAIL_COND(p_caret > carets.size());
	if (!is_editable() || !DisplayServer::get_singleton()->has_feature(DisplayServer::FEATURE_CLIPBOARD_PRIMARY)) {
		return;
	}
	String paste_buffer = DisplayServer::get_singleton()->clipboard_get_primary();
	if (carets.size() == 1) {
		Point2i pos = get_line_column_at_pos(get_local_mouse_pos());
		deselect();
		set_caret_line(pos.y, true, false);
		set_caret_column(pos.x);
	}
	if (!paste_buffer.is_empty()) {
		insert_text_at_caret(paste_buffer);
	}
	grab_focus();
}
void TextEdit::_generate_context_menu() {