Matthias Kuhn 8eca38ca5f Attribute table performance when deleting features
This fixes performance issues with the attribute table visible when deleting a
large number of features.

The attribute table tries to behave smart in the following way:

 * It tries to remove only the deleted rows as long as they are in one or a few
   single blocks
 * If there are more than 100 rows to delete and it starts to delete blocks
   of a size smaller than 10 it assumes that the selection to delete is widely
   distributed and that a reload of the whole model is less expensive than a
   differential update.

Fix #10167
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