After a long search trying to figure out why our records weren't being removed, I have discovered that there is a bug in the datasource method removeRecordByKey: if the original data source is a simple array, the item in origDs will not be removed.

This is a problem if the grid is rebound since the original data source will be used.

We discovered this issue because we had to use the dataSource deleteRow method directly due to severe performance issues that occur when attempting to remove a large number of rows through the standard updating method deleteRow. We have a scenario where we could remove hundreds of items from the grid at once because the user has chosen to process them in some way that requires their removal.

The workaround that we implemented was to test each data source that is processed by the loop to see if the primary key value was present and, if not, use the index of the primary key column from the datasource's schema.