### Godot version

v4.0.beta.custom_build [13f0158]

### System information

Windows 10

### Issue description

When doing operations (`begin_complex_operation` and `end_complex_operation`) with multiple selections in TextEdit, some of these selections don't revert upon undo. This behavior is affects some of script editor's operations, like duplicate selection and delete lines.

### Steps to reproduce

Open script editor, make multiple selections. Keep in mind what you have selected. Do duplicate selection (ctrl+shift+D). Undo (ctrl+Z). Compare the result to what you remember.

### Minimal reproduction project

N/A
ERR_FAIL_INDEX_V(p_line, text.size(), Vector<String>());
	Vector<String> lines;
	if (!is_line_wrapped(p_line)) {
		lines.push_back(text[p_line]);
		return lines;
	}
	const String &line_text = text[p_line];
	Vector<Vector2i> line_ranges = text.get_line_wrap_ranges(p_line);
	for (int i = 0; i < line_ranges.size(); i++) {
		lines.push_back(line_text.substr(line_ranges[i].x, line_ranges[i].y - line_ranges[i].x));
	}
	return lines;
}
void TextEdit::set_smooth_scroll_enabled(const bool p_enabled) {