react-datetime renders too much html elements without a reason

[jocoone]

I'm Submitting a ...

[ ] Bug report
[ ] Feature request
[x] Support request

Steps to Reproduce

If the datepicker is loaded into the DOM, it already exists out of more than 70 DOM-nodes. Therefor if a lot of datepickers are rendered on screen, the UI becomes very laggy.

Expected Results

These DOM-nodes should only be rendered when the datepicker is open.

Actual Results

Only render the datepicker when it is open.

Other Information (e.g. stacktraces, related issues, suggestions how to fix)

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[arqex]

Thanks for raising the issue. The rendered calendar is needed in case we wanted to animate when the calendar opens or closes. But it's true that we don't need the whole picker with its content to start the animation, so probably we can render only the container. That would be an enhancement.

[arqex]

We are tackling the issue at #732