[WebView] ComboBox and DropDownList - Render fragments of the scrollbar are visible

FULL PRODUCT VERSION :


A DESCRIPTION OF THE PROBLEM :
A huge number of web pages use Teleriks Kendo UI (http://www.telerik.com/kendo-ui) and we recognized JavaFX's WebKit version has problems with the ComboBox and DropDownList control.

DropDownList-Screenshot:
https://drive.google.com/open?id=0B7P_rknS1TWxU1ZncWo2X19IX0U

ComboBox-Screenshot:
https://drive.google.com/open?id=0B7P_rknS1TWxQW16bm9UNUpfMHM

We've created a jsbin which helps you to reproduce that issue:
https://output.jsbin.com/rexufa

-) No render fragments are visible on Apple's safari browser.
window.navigator appVersion:
5.0 (Macintosh; Intel Mac OS X 10_10_3) AppleWebkit/600.5.17 (KHTML, like Gecko) Version/8.0.5 Safari/600.5.17

-) REGRESSSION: No render fragments in case of JRE 8u101

REGRESSION. Last worked in version 8u101

ADDITIONAL REGRESSION INFORMATION:
java version "1.8.0_111"
Java(TM) SE Runtime Environment (build 1.8.0_111-b14)
Java HotSpot(TM) 64-Bit Server VM (build 25.111-b14, mixed mode)

STEPS TO FOLLOW TO REPRODUCE THE PROBLEM :
Open the following URL by using JavaFX's webview:
https://output.jsbin.com/rexufa

EXPECTED VERSUS ACTUAL BEHAVIOR :
EXPECTED -
No render fragments
ACTUAL -
render fragments of the scrollbar are visible if the user opens or closes a combobox/DropDownList

REPRODUCIBILITY :
This bug can be reproduced always.

CUSTOMER SUBMITTED WORKAROUND :
No workaround found