Leak in dojox/widget/_CalendarBase

[adros]

Instance of '_CalendarBase' is destroyed and recreated again on each 'openDropDown' call. But sub-widgets (views) created by _CalendarBase's postCreate method are not destroyed correctly. So the number of widgets in registry rises with each dropdown opening.

Possible solution is to own the created subwidgets in _CalendarBase's 'postCreate' method using 'this.own(widget)'. Or other solution could be replacing this code in dijit/form/_DateTimeTextBox's 'openDropDown' method:

if(this.dropDown){
    this.dropDown.destroy();
}

for:

if(this.dropDown){
    this.dropDown.destroyRecursive();
}

[dylan]

Will consider for 1.12.

[dylan]

Ticket planning... move current 1.13 tickets out to 1.15 to make it easier to move tickets into the 1.13 milestone.