Events get duplicated times when dropping and updating them from the options object

[johannesjo]

Follow up to: #357

Steps to recreate:

1. Go to https://codesandbox.io/s/ecstatic-colden-xernn?file=/src/app/app.component.ts
2. Start to drag around the tasks in the daily agenda view like a mad man.

Result:
Events will be duplicated multiple times until the calendar is completely rererendered (by navigating away and then back).

Is your bug/feature applicable to the core project, without Angular?

I am not sure.

[acerix]

Thanks, I can see the issue but I'm not sure it's a bug in the calendar. It's best if you can provide a more minimal demo, for example by starting with the example project and only adding the code which causes the bug.

https://codesandbox.io/s/github/fullcalendar/fullcalendar-example-projects/tree/master/angular?file=/src/app/app.component.ts

[johannesjo]

Here is a little bit more reduced example:
https://codesandbox.io/s/old-wind-7vdf3?file=/src/app/app.component.ts

Please pay attention to line 62. This is the (only) place where the calendar get's updated and the data passed, does not match with what is displayed.

[acerix]

Thanks for the details. I'm not very familiar with how Angular works and was suspicious the issue was related to setInterval but this does seem like a bug now.

[johannesjo]

@acerix yes, it seems so. Looking at the code for the angular integration my suspicion would be that this is at least partly a problem of fullcalendar itself as the correct options get passed as they should.

And if I may say so: Additionally the part with pauseRendering and resumeRendering smells like a race condition looming somewhere :)

[johannesjo]

After playing around with it some more I recognized, that this seems (at least also) to be happening while an event is being dragged around and not necessarily when it is dropped.

EDIT: Though it also happens only after an event was resized.

[johannesjo]

Would you accept PRs in case I find the cause of it? Unfortunately that's a real blocker for Super Productivity's calendar feature.

[shyamal890]

I am able to reproduce this issue too @acerix

[arshaw]

This ticket is superseded by the other ticket you made @johannesjo:
fullcalendar/fullcalendar#6218 (comment)
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I reopened it and made a new comment