gary-b 821b8f09d6 fix(forms): ensure select[multiple] retains selections
If you bound an array to select[multiple] via ngModel and subsequently
changed the options to select from, the UI would drop any selections
made since by the user. This was due to
SelectMultipleControlValueAccessor not keeping a reference to the new
model arrays it generated when users interacted with the select control.
Update code to keep the reference.

Closes #12527
Closes #12654
2016-12-14 08:52:07 -08:00
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