Calendar doesn't clean up modality

[jensengar]

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Current behavior
Calendar with ui-touch enabled doesn't always disableModality. I noticed this when putting the calendar component in a ngbModal. With the calendar displayed, click outside the modal. You are left with just a dark overlay and can't interact with anything on the page. My suspicion is the ngbModal is destroying the components outright but the calendar doesn't fully clean up after itself.

Expected behavior
Calendar should clean up after itself (modality included) when it's destroyed. I suspect all you need to do is call disableModality in ngOnDestroy.

I have a workaround in my own code and don't have time to pr a fix right now. Workaround is to simply call the Calendar's disableModality fn when cleaning up the ngbModal.

[jonasvoelcker]

I've got the same issue and fixed it in my calendar.js according to the behaviour of "onInputKeydown".

I would really much appreciate it to merge in my pull request:

#7175