Fix problem where hidden scrollbars prevent clicks through to the scrollable content area on Chrome(webkit?) browsers on Windows.

https://code.google.com/p/google-web-toolkit/issues/detail?id=7576

This is not a fix for the same/similar issue on Mac OS for Chrome and Safari.

Fix suggested by Steven Arth:
https://code.google.com/p/google-web-toolkit/issues/detail?id=7576#c34

Review at http://gwt-code-reviews.appspot.com/1886803


git-svn-id: https://google-web-toolkit.googlecode.com/svn/trunk@11480 8db76d5a-ed1c-0410-87a9-c151d255dfc7

user/src/com/google/gwt/user/client/ui/ResizeLayoutPanel.java

diff --git a/user/src/com/google/gwt/user/client/ui/ResizeLayoutPanel.java b/user/src/com/google/gwt/user/client/ui/ResizeLayoutPanel.java
index 2f4dac6..49f1278 100644
--- a/user/src/com/google/gwt/user/client/ui/ResizeLayoutPanel.java
+++ b/user/src/com/google/gwt/user/client/ui/ResizeLayoutPanel.java
@@ -140,6 +140,7 @@
       expandable.getStyle().setHeight(100.0, Unit.PCT);
       expandable.getStyle().setWidth(100.0, Unit.PCT);
       expandable.getStyle().setOverflow(Overflow.SCROLL);
+      expandable.getStyle().setZIndex(-1);
       elem.appendChild(expandable);
       expandableInner = Document.get().createDivElement().cast();
       expandable.appendChild(expandableInner);
@@ -160,6 +161,7 @@
       collapsible.getStyle().setHeight(100.0, Unit.PCT);
       collapsible.getStyle().setWidth(100.0, Unit.PCT);
       collapsible.getStyle().setOverflow(Overflow.SCROLL);
+      collapsible.getStyle().setZIndex(-1);
       elem.appendChild(collapsible);
       collapsibleInner = Document.get().createDivElement().cast();
       collapsibleInner.getStyle().setWidth(200, Unit.PCT);