Clicking optgroup closes dropdown

[samesfahani]

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Example: http://www.iainheng.com/assets/fo/scripts/selectize0/examples/optgroups.html

If you open up any of the dropdowns on the demo with an optgroup, clicking the optgroup will close the entire dropdown even with closeAfterSelect set to false. This behavior is not standard with native optgroups.

[samesfahani]

Possible culprit: https://github.com/selectize/selectize.js/blob/master/src/selectize.js#L226

Seems like this logic doesn't handle the case where e.target was the div that represents the optgroup. Adding something like a || $.contains(self.$dropdown[0], e.target) to the condition set (to short circuit) might fix the issue... Can't speak to how performant that is though.

[MeesterDev]

I think #762 should fix this.

[risadams]

closing stale issues older than one year.
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