Fix #1665 : searchable-option-list bulk operations are slow

[idodeclare]

Hello,

Please consider for integration this patch to fix the bulk operations that are slow when the project count in the thousands (Select-All, Invert-Selection, Clear) by adding a Map by val() and also avoiding creating HTML elements when exceeding a defined maxShow.

When a bulk operation is in-progress, the X-Items-Selected update is deferred and only done at the end of the operation.

I encountered one testing problem which I need advice for: I was running with a thousand test projects, but my system could not actually support a query for all 1000 projects, and it showed a page with just 0. On hitting Back, the page was not in a consistent state, and Select-All, Invert-Selection, and Clear did not work as expected. Any advice?

Thank you.

[tarzanek]

lgtm, +1 for merge

[idodeclare]

Ohhhhhhhhhh sorry I introduced a bug. When the SOL is being bound by maxShow, and you X a shown item, another selected item should be shown — but I removed that bit not understanding. Luckily this is for the non-bulk UI, so let me see about effectively restoring that behavior.