### 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
return st_args;
}
void TextEdit::set_tab_size(const int p_size) {
	ERR_FAIL_COND_MSG(p_size <= 0, "Tab size must be greater than 0.");
	if (p_size == text.get_tab_size()) {
		return;
	}
	text.set_tab_size(p_size);
	text.invalidate_all_lines();
	_update_placeholder();
	queue_redraw();
}
int TextEdit::get_tab_size() const {
	return text.get_tab_size();
}
void TextEdit::set_overtype_mode_enabled(const bool p_enabled) {
	if (overtype_mode == p_enabled) {
		return;
	}
	overtype_mode = p_enabled;
	queue_redraw();
}
bool TextEdit::is_overtype_mode_enabled() const {
	return overtype_mode;
}
void TextEdit::set_context_menu_enabled(bool p_enabled) {