Key event consume() method doesn't work.
Please use attached POC to reproduce.
Tagging as regression because it worked properly in older versions of 9 (e.g, 9 b13).

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Below goes info from Evergreen test executors:

Testsuite name: FXCompatibilityManual
Test name(s): graphics/api/control/ToggleButtonTest2Test.java
Product(s) tested: JDK9b125 (64bit)
OS/architecture: Mac10.11-x64

Reproducible: Always
Reproducible on machine: Evergreen-machine
[If Sometimes] Also reproducible on machine:

Is it a Regression:
[If Regression] Regression introduced in release/build:
Test result on the last GAed release for this train:
[if Fail] Test result on FCS:

Is it a platform specific issue:
[If platform specific issue] Is it a new (previously unsupported) OS/browser/mode testing:
[If new configuration testing] Issue specific to execution mode or OS/browser version:

Steps to reproduce:
1. Install Test build JDK9b125 (64bit) and set JAVA_HOME env
2. use test bundle:java-client-9-manual.tar.gz and extract to a folder of java-client-9-manual <WS>
3. Install ANT (version:1.9.7) and set ANT_HOME env
4. Change javafx.home path in build.properties file(under the folder <WS>)
5 Enter the testsuite "JavaCompatibilityManual" directory(under the folder<WS>) and run command: ant run-manual
6. Run the case: graphics/api/control/ToggleButtonTest2Test.java in the harness.

Instructions:
1.Select the 'boundsInParent' Checkbox & rectangle is around the ToggleButton.
2.Click on the ToggleButton & press Left Arrow key . Observe that ToggleButton & boundsInParent rectangle translates left side.
3.Press Right Arrow key . Observe that ToggleButton & boundsInParent rectangle translates right side.
4.Press Up Arrow key. Observe that ToggleButton & boundsInParent rectangle translates Up side.
5.Press Down Arrow key. Observe that ToggleButton & boundsInParent rectangle translates Down side.

Actual result:
The Toggle button can not translate up/down side continuously when pressing up/down arrow key several times.
Press up arrow key once,the button translates up side and loses focus;
Press up arrow key again,the button can not translates up side.

By the way, JDK8 on mac, The Toggle button can translate up/down side continuously when pressing up/down arrow key several times