Drop of pick list involuntary in multi select item with hint set

[addy_hu]

I have a multi select item whose apprearance is MultipleAppearance.PICKLIST. And I call the setHint of the item in the changedHandler to display how much values have been selected dynamically. When there are huge values in the value map, there is a strange behavoir with the scrollbar:
I select a value "A", and drag the scrollbar to the end to select a value "Z";
Then I go up to deselect "A", the pick list will be dropped automatically to the value "Z" instead of stay near "A".
I have tried that if I don't use setHint, it will be corrected, no more strange involuntary drop.
Thanks in avance if there is any help.

[Isomorphic]

Sounds like a very weird effect. If you can create a minimal, ready-to-run test case that has been verified to show this behavior in an unmodified SDK, we can take a look and see if there's a framework issue involved.