Order Events need raising

[Greedquest]

The synchrolist raises buffered events on addition which is good for ui. But on sorting/filtering only 1 event is raised (1st change event).

Solution would be to have a clear from index method in content. First change index can be found then cleared from there raising no event and re added as normal. That gives proper re-ordering events although it would trigger a load more on-removal then on-addition events. Perhaps another limbo state is in-order

[Greedquest]

Ok 9766f36 did make this change, but now sort on addition means things are added then removed for sorting then added back then removed for sorting etc. as sort only checks where te 1st item ends up, and needs to check all of them instead. Also we don't want to raise the onaddition event on unsorted things if sortonaddition is specified