Some meetings are sometimes temporarily listed twice

[pieterdd]

Checklist

• [x] I can reproduce the bug with the latest version given here.
• [x] I made sure that there are no existing issues - open or closed - to which I could contribute my information.
• [x] I made sure that there are no existing discussions - open or closed - to which I could contribute my information.
• [x] I have read the FAQs inside the app (Menu -> About -> FAQs) and my problem isn't listed.
• [x] I have taken the time to fill in all the required details. I understand that the bug report will be dismissed otherwise.
• [x] This issue contains only one bug.
• [x] I have read and understood the contribution guidelines.

Affected app version

1.6.0

Affected Android/Custom ROM version

Android 16 (problem not specific to any ROM)

Affected device model

Pixel (not a device-specific bug)

How did you install the app?

None

Which calendar service or provider do you use, if any?

The screenshots below are from a Google Calendar source

Which sync adapter app do you use for calendar synchronization, if any?

DAVx5

Steps to reproduce the bug

I haven't yet found a consistent reproduction method, but it regularly happens to me when I've just opened the app.

Expected behavior

Every meeting is shown only once.

Actual behavior

Some meetings may be shown twice:

After clicking around some more in the interface, the meeting usually deduplicates itself:

I feel like the notifications of such meetings also duplicate, but that might be a separate issue and I haven't captured screenshot evidence of it yet.

Screenshots/Screen recordings

No response

Additional information

No response

[naveensingh]

• Have you checked if these events are also duplicated in the Google Calendar app or in other clients?
• Does the duplication happen only in the Monthly and daily view or in every view?

[pieterdd]

Have you checked if these events are also duplicated in the Google Calendar app or in other clients?

As far as I can remember they duplicate neither in the Google Calendar web interface nor in another client I imported the ICS file in.

Does the duplication happen only in the Monthly and daily view or in every view?

I also see it in other views. In the weekly view I see two blocks representing the same meeting next to each other. Regardless of the view I have open, it usually fixes itself within 60 seconds of opening the app (that's a guesstimate). I don't recall ever seeing the reverse happen (meeting that wasn't duplicated suddenly duplicates).

[naveensingh]

What timezone are you in?

If it appears to be affecting only some events, it would help if you export them and share an ICS file (anonymized).

[pieterdd]

CET/CEST. Sure, I could look into crafting an anonymized ICS file that reproduces the problem when I have more time.

[pieterdd]

I've attempted to extract and anonymize the event that was producing the behavior at https://gist.github.com/pieterdd/14acb54c43846006db8b41f1a133080f/raw/b4c93fb45016a731e021ce7d705cccde728b1c0d/testcal.ics but I might have broken the ICS file in the process. While it's syntactically valid according to https://icalendar.org/validator.html, when I import it in Google Calendar via URL to funnel it into DAVx, Google Calendar doesn't show any events.

Interesting to note is that the event was a recurring one. I'll keep my eyes open to check if it only occurs for recurring events.

Edit: I think I know why the extraction didn't work properly. Will look into this further when time allows.

[pieterdd]

This calendar should contain all data relevant to a recurring event that was manifesting the issue: https://gist.github.com/pieterdd/e6866e9b26a6b398e677c2e5d64dd0dc/raw/5320abe29392c678f75cfaf3352a9c5cab25364d/testcal2.ics

I've imported it into Google Calendar via URL, where it shows up fine. Then I tried to import it through DAVx via Google Calendar. Curiously, instead of temporarily showing a duplicate event on August 29th, Fossify Calendar does not show any events at all. https://icalendar.org/validator.html confirms that the calendar's syntax is valid.

[naveensingh]

I was able to reproduce it now, thanks.

The duplication seems to be caused by improper sync logic for overridden occurrences (exceptions).