[Integrated] RFR: 8236912: Preventing NPE when clicking WebView with forward/back mouse buttons

[Kevin Rushforth]

Changeset: aa6f3a4e
Author:    Robert Lichtenberger <rlichten at openjdk.org>
Committer: Kevin Rushforth <kcr at openjdk.org>
Date:      2020-01-27 13:43:47 +0000
URL:       https://git.openjdk.java.net/jfx/commit/aa6f3a4e

8236912: NullPointerException when clicking in WebView with Button 4 or Button 5

Reviewed-by: ghb, kcr

! modules/javafx.web/src/main/java/javafx/scene/web/WebView.java
! modules/javafx.web/src/test/java/test/javafx/scene/web/WebViewTest.java