### 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
for (int i = 0; i < text.size(); i++) {
		text.write[i].data_buf->set_width(width);
		text.write[i].data_buf->set_break_flags(brk_flags);
		if (tab_size_dirty) {
			if (tab_size > 0) {
				Vector<float> tabs;
				tabs.push_back(font->get_char_size(' ', font_size).width * tab_size);
				text.write[i].data_buf->tab_align(tabs);
			}
		}
		text.write[i].width = get_line_width(i);
	}
	tab_size_dirty = false;
	_calculate_max_line_width();
}
void TextEdit::Text::invalidate_font() {
	if (!is_dirty) {
		return;
	}
	max_width = -1;
	line_height = -1;
	if (font.is_valid() && font_size > 0) {
		font_height = font->get_height(font_size);
	}
	for (int i = 0; i < text.size(); i++) {
		invalidate_cache(i, -1, false);
	}
	is_dirty = false;
}
void TextEdit::Text::invalidate_all() {