Previously in CPTableTView, a view being edited was not cached when unloaded, for example when made invisible after scrolling or when calling -reloadData.
This situation was causing a duplicated view to be added at the same place when the data view was loaded again.
After this commit, edited data views are cached and resign their first responder status just before they are added to the queue because they can be reused at another place.
Test: Added a "reload data" button in ViewBasedCib example.
Added documentation for tableView:dataViewForTableColum:row: delegate method. Document other cases, when we expect the data view to have a CPViewNotSizable mask.
ViewBasedCib example: added variable row heights.
A non bezeled text field is now bezeled when edited and unbezeled when editing ends - including when you hit enter (but text has to be modified, see comment in code)