### 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(p_line, text.size());
	text.write[p_line].data = p_text;
	text.write[p_line].bidi_override = p_bidi_override;
	invalidate_cache(p_line, -1, true);
}
void TextEdit::Text::insert(int p_at, const Vector<String> &p_text, const Vector<Array> &p_bidi_override) {
	int new_line_count = p_text.size() - 1;
	if (new_line_count > 0) {
		text.resize(text.size() + new_line_count);
		for (int i = (text.size() - 1); i > p_at; i--) {
			if ((i - new_line_count) <= 0) {
				break;
			}
			text.write[i] = text[i - new_line_count];
		}
	}
	for (int i = 0; i < p_text.size(); i++) {
		if (i == 0) {
			set(p_at + i, p_text[i], p_bidi_override[i]);
			continue;
		}
		Line line;
		line.gutters.resize(gutter_count);
		line.data = p_text[i];
		line.bidi_override = p_bidi_override[i];
		text.write[p_at + i] = line;
		invalidate_cache(p_at + i, -1, true);
	}
}
void TextEdit::Text::remove_range(int p_from_line, int p_to_line) {