[Bug 1092910] Re: Merge notifications of two incoming messages from the same person

[Aurélien Gâteau]

The FDO spec does not explicitly support merging. What happens is
notify-osd remembers the last notification and merges the new one in it
if it satisfies a set of rules mentioned here:
https://wiki.ubuntu.com/NotifyOSD#Merging_notifications

One of those rules is that the application must set a particular hint in the notification. Quoting notify-osd page:
"""
If the hint “x-canonical-append” is supplied with a string value “allowed”, and replaces_id is not specified, the bubble should be treated as if it allows merging. 
"""

KNotification API does not let the application pass custom hints, so it
is impossible for any application using this API to support merging
notifications. It could be possible to fix this by doing one of those:

1. Remove the need for the "x-canonical-append" hint in notify-osd.

2. Modify knotify (the daemon handling notifications behind
KNotification) to always pass the "x-canonical-append" hint.

3. Extend KNotification and knotify to allow applications to pass
arbitrary hints *and* patch applications to pass the "x-canonical-
append" hint.

Of those three, 1. seems doable, 2 and 3 are unlikely to happen.

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Title:
  Merge notifications of two incoming messages from the same person

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