I'm not sure we can ever run into this issue anymore since we stop
calculating TTS / NDL past 2 hours, but I guess on a fairly slow CPU this
still could take too long.
But instead of calling into MainWindow let's just change the setting right
here and add a signal to show the notification - that way we can use the
appropriate way to make such notifications on the mobile app.
Signed-off-by: Dirk Hohndel <dirk@hohndel.org>
000c9cc21c