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Hi there
I added support for generic filter functions. My use-case:
The user can select multiple criteria from a drop-down in the header. Items are kept if they match any of these criteria (OR). This is just what I needed, though. The implementation in iron-data-table is generic and can be used for any complex filter task like combining filters from several columns or whatever.
I tried to touch as little of the existing code as possible, however, I needed to change the way filters are indexed because filter-functions do not have a filterBy property (it's not required and potentially makes the usage of filter functions more difficult for client programmers if it were) which was used as a key for filters. This may change the behavior where client programmers did unhealthy things like using the same filterBy in multiple columns.
I modeled the feature after the "filter" property of Polymer's dom-repeat.
Ugh, and thanks for that great table, love it :-)
This change is