https://bugs.kde.org/show_bug.cgi?id=429323

            Bug ID: 429323
           Summary: very old "phantom" notifications are periodically
                    re-sent even though they've been cleared
           Product: kdeconnect
           Version: unspecified
          Platform: Android
                OS: Android 9.x
            Status: REPORTED
          Severity: normal
          Priority: NOR
         Component: android-application
          Assignee: albertv...@gmail.com
          Reporter: adam.m.fontenot+...@gmail.com
  Target Milestone: ---

SUMMARY

Many times per day, I'll receive a dozen or more notifications on the Desktop
received from my Android phone with KDE Connect. Most of these notifications
originally appeared months or even years before, and obviously, no longer
appear on Android. 

STEPS TO REPRODUCE
n/a

OBSERVED RESULT

I see many old notifications. One for example is for a file I downloaded. I
still have that file on the phone, and it was last modified in August 2019. So
it's likely that this notification is over a year old!

EXPECTED RESULT

I should *never* be sent a notification if that notification does not exist /
has already been cleared on Android.

SOFTWARE/OS VERSIONS
Linux: Arch Linux x86_64 kernel 5.9.8
KDE Plasma Version: 5.20.3
KDE Frameworks Version: 5.76.0
Qt Version: 5.15.1

ADDITIONAL INFORMATION

I found this relevant post on Reddit:
https://www.reddit.com/r/kde/comments/j1ogij/anyone_else_get_randomly_spammed_by_old/
which received quite a few upvotes and users commenting that they also see this
issue.

The user who posted it said that it's this issue
https://bugs.kde.org/show_bug.cgi?id=411753 but I believe that's wrong. I
*also* see that issue, but that seems to just be referring to receiving many
*unread* notifications all at once. They're only "old" in virtue of the fact
that the user hasn't bothered to clear them yet and they get resent when the
device wakes up. I'm referring to something different: notifications that have
already been cleared still reappear periodically.

It might be related to this bug: https://bugs.kde.org/show_bug.cgi?id=413015
but the user there only specified a problem with yandex-browser. I see this
with many different applications.

Attempted fixes: I have tried completely removing and reinstalling KDE Connect,
I've cleared the data storage on Android for the apps that I'm seeing the
phantom notifications from, etc. Nothing has helped. These old notifications
are stuck somewhere in the ether and nothing I've been able to do has gotten
rid of them.

This could be a device specific issue: this is a Google Play edition Moto X4,
on stock Android 9. (That said, a *lot* of different users reported seeing this
issue in the Reddit thread.) If it *is* a device specific or Android issue, I
think a reasonable enough workaround would be for the KDE connect app to check
whether a notification actually exists (i.e. is currently being shown in the
notification drawer) before sending it to the desktop component. 

--

Side note: is this application maintained? I see a ton of bug reports on this
tracker that haven't been triaged, and the automatic assignee, Albert Vaca,
does not seem to have been active on this site for about a year, as far as I
can tell. Additionally, the version box is missing anything after 1.10. I am
using KDE Connect 1.15.1.

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