This is similar to JDK-8349756, but in TreeTableView. I haven't distilled it down to a simple test program, but the following will show the leak:

_JAVA_OPTIONS="-verbose:gc" gradle --info -PTEST_ONLY=true -PFULL_TEST=true -PUSE_ROBOT=true :systemTests:test --tests NodeInitializationStressTest.treeTableView

Sometimes the test will pass, but often it will throw OOM.

I can reproduce this on two different MacBook systems.



## Root Cause
An event handler was installed on the root property without removing it when the root changes.

## Solution
Replaced the weak parts with a change listener to the root property to ensure correct handling of the root value changes.