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Is it possible with MultiSelectTable to not select rows? If the table is initially created, there are no selections. But once I've selected a row, I can only select another row, and not deselect the current row (without selecting a new row).
I have a 0:N relations that I edit with a MultiSelectTable, therefore selecting not any row is also a valid selection.
The Table's multiselect mode works like that. Additional rows are selected with CTRL/CMD(mac). There is also the "legacy multiselect mode" setMultiSelectMode(MultiSelectMode.SIMPLE).
If you want to ensure there is a selection, you should verify that with a validator. Then you can easily maintain the state of Save button so that invalid stuff don't get into your backend. With AbstractForm (Viritin helper class) this is handled automatically for you.