Commit 61ae4984 authored by David Faure's avatar David Faure

Speed up NotificationSubscriber::acceptsItemNotification

Hotspot spotted a lot of time spent resolving mimetype aliases
while processing notifications
http://www.davidfaure.fr/2020/qmime_alias.png

We might as well resolve to canonical aliases upfront,
setting up subscriptions happens a lot less than actual notifications.
parent c1359d48
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