Reset previous selection when repeating calls to multi-select #276
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When multi-select is called several times on the same 'select' HTML element (e.g. when this 'select' element is updated with fresh data from a database each time it is displayed), it is necessary to reset previous selections (if any) before processing current selected / unselected items, otherwise items that were in the class 'ms-selected' will remain in this class, and will therefore be (wrongly) displayed as selected.
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When multi-select is called several times on the same 'select' HTML
element (e.g. when this 'select' element is updated with fresh data
from a database each time it is displayed), it is necessary to
reset previous selections (if any) before processing current
selected / unselected items, otherwise items that were previously in the class
'ms-selected' will remain in this class, and will therefore be
(wrongly) displayed as selected.