func (ui *UI) Enqueue(f func()) {
// Proxy the function to the main thread by using g_idle_add.
// You'd be tempted to want to pass f to g_idle_add directly, but
// (a) passing closures into C code is annoying, and (b) we need a
// reference to the function on the Go side for GC reasons. So
// it's easier to just put the function in a channel that pulls it
// back out on the other thread.
ui.enqueued <- f
C.g_idle_add(C.GSourceFunc(C.smash_idle_cb), globalPointerStore.Key(ui))
}
func issue(f *func()) {
C.gdk_threads_add_idle(C.GSourceFunc(C.xdoissue), C.gpointer(unsafe.Pointer(f)))
}