in src/platform_impl/linux/x11/util/hint.rs [152:160]
fn add_func(&mut self, func: c_ulong) {
if self.hints.flags & mwm::MWM_HINTS_FUNCTIONS != 0 {
if self.hints.functions & mwm::MWM_FUNC_ALL != 0 {
self.hints.functions &= !func;
} else {
self.hints.functions |= func;
}
}
}