When showing multiple months and the current month is not displayed first (e.g. because of
maxDate: 0), the user needs to click the previous button multiple times in order to see any effect.
In this example 3 clicks are needed https://jsfiddle.net/qetg5hgm/6/, which makes the button seem broken initially. The number of required clicks depends on the values for
This is a regression, since jQueryUI v1.11.4 works as expected https://jsfiddle.net/qetg5hgm/7/
May be related to #15102, but IIRC
showCurrentAtPos had some bug of its own.