Bug in indirect selection, while using the filter plugin

[nedosa@…]

It seems the IndirectSelection? and Filter plugins do not play well together.

In 1.6b1,

• If we augment test_enhanced_grid_filter.html, with the indirectselection plugin
• filter the grid, so that we get a subset of results
• tick the boxes of a couple of the filtered entries
• and finally clear the filter

result:

• selected (ticked) entries are different than the ones initially selected. In fact, it seems that the index is selected, but not the entry, in other words, if the 2nd filtered entry was selected, when the filter is cleared, the 2nd entry in the unfiltered list ends up being selected.

[evan]

The same cause as #10855, fixed by [23422], to make it work:

1. ID is needed for data store items
   
2. A keepSelection = true attribute should be added to EDG