Improve Calendar initial render performance #1817
Merged
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Drastically improves initial render times for Calendar component when there are a large number of calendars on the page (>100).
In a test rendering 100 calendars render speed dropped from >4seconds to render, to less than 400ms.
Fix involves only rendering the calendar component when the overlay is display (either when the input field has focus, or is set to inline mode).
Fixes remaining issues for #1785