This is better than watching whether ngramsParent is Nothing because
subtrees could be edited as well.

Doesn't work yet as expected, but some progress made in good direction.

* #377

* #375

* #399

* #403

* #401

* #378

* #386
* #392

* #387

This prevents flickering of docs table when moving docs to/from trash
and updating the chart.

* #393

Also enables settings on root/parent folder

* #376: rc2.x

* #375: rc7.x

* #375: rc6.x

* #375: rc5.x