DatetimeSelector ValueChanged callback does not include PreviousValue

[OhHey-ItsDave]

DatetimeSelector widget's protected methods: onDateEdited(), onTimeEdited(), and onTimeZoneChanged() do not include the previous value from the "evt" struct passed into them with the "evtOut" struct they then pass to the ValueChanged callback in App Designer.

Result is that the callback exposed within App Designer's Code View will always have "event.PreviousValue" equal "[ ]".

widgets-toolbox/widgets/+wt/DatetimeSelector.m

Line 316 in 4028f19

function onDateEdited(obj,evt)

[OhHey-ItsDave]

Issue can be corrected by recording widget's current Value at the top of these functions, before edits are made.

newValue = evt.Source.Value; % Already present
previousValue = obj.Value; % Added previousValue variable

Then including the previousValue in evtOut

evtOut = wt.eventdata.ValueChangedData(obj.Value, previousValue); % Modified evtOut