FULL PRODUCT VERSION :
openjdk version "1.8.0_72-internal"
OpenJDK Runtime Environment (build 1.8.0_72-internal-b05)


ADDITIONAL OS VERSION INFORMATION :
Linux 4.2.0-1-amd64 #1 SMP Debian 4.2.6-1 (2015-11-10) x86_64 GNU/Linux

EXTRA RELEVANT SYSTEM CONFIGURATION :
This also happens in older versions of Java 8 on Linux, not new to this update.

A DESCRIPTION OF THE PROBLEM :
On Linux, Dropdown lists disappear on mouse movement, making them impossible to use. The problem can be seen in SceneBuilder, for example.

STEPS TO FOLLOW TO REPRODUCE THE PROBLEM :
One example for reproducing - in SceneBuilder -

1. Select a "Label" control.
2. Open the "Font" property.
3. Click on either "Family" or "Style"
4. Move mouse to try and select an option

EXPECTED VERSUS ACTUAL BEHAVIOR :
EXPECTED -
The dropdown should remain visible until a selection is made, or else another control is clicked
ACTUAL -
The dropdown disappears as soon as the mouse moves, even if movement is into the dropdown list.

REPRODUCIBILITY :
This bug can be reproduced always.