A DESCRIPTION OF THE PROBLEM :
I'm trying to develop a demo application that uses a TreeView. The problem is that sometimes when clicking on the small triangle on the left of an item the entire application hangs and I'm forced to kill it.

I tried also the workaround to programmatically select the first item without appreciable success.

Also, you can see that the triangles (representing the collapsed/expanded status of an item) sometimes are in a wrong state (pointing to the right even if the item is expanded or pointing to the bottom if the item is collapsed). Not only this, but I can see that in a random fashion when collapsing or expanding an item determines the status change of the triangle of other items.

Trying to downgrade to JDK 8 the problem disappears.

REGRESSION : Last worked in version 8u172

STEPS TO FOLLOW TO REPRODUCE THE PROBLEM :
Create a TreeView.
Add some nested items on it.
Try to play with items expanding and collapsing them.

EXPECTED VERSUS ACTUAL BEHAVIOR :
EXPECTED -
The clicked item will expand or collapse according with its previous status.
ACTUAL -
Sometimes the application freezes forever.
Sometimes the TreeView shows the wrong status for the items.
Playing with an item randomically influences the status of others.

FREQUENCY : always