Run the app.
Switch on editing
Try to edit some cell.
Sometimes, I see 2-3 coming onEditStart events. As many onEditCancel events I see, when I cancel edit.

Affected tests:
ControlsAutomatedTestSuite/javafx/scene/control/test/treetable/TreeTableAsTreeTest/testOnEditCommit
ControlsAutomatedTestSuite/javafx/scene/control/test/treetable/TreeTableAsTreeTest/testOnEditStartCancel