Fix scrollbar for Window under WebKit browsers (#11994)

Change-Id: Ie39d521c2f299bca0e2175fd8bb59beaa4f66241

1 files changed, 31 insertions, 0 deletions

diff --git a/client/src/com/vaadin/client/ui/VWindow.java b/client/src/com/vaadin/client/ui/VWindow.java
index 1331eb106a..ff6a15e597 100644
--- a/client/src/com/vaadin/client/ui/VWindow.java
+++ b/client/src/com/vaadin/client/ui/VWindow.java
@@ -342,6 +342,37 @@ public class VWindow extends VOverlay implements ShortcutActionHandlerOwner,
         if (!visibilityChangesDisabled) {
             super.setVisible(visible);
         }
+
+        if (visible && BrowserInfo.get().isWebkit()) {
+
+            /*
+             * Shake up the DOM a bit to make the window shed unnecessary
+             * scrollbars and resize correctly afterwards. This resulting code
+             * took over a week to summon forth, and involved some pretty hairy
+             * black magic. Don't touch it unless you know what you're doing!
+             * Fixes ticket #11994
+             */
+            Scheduler.get().scheduleFinally(new ScheduledCommand() {
+                @Override
+                public void execute() {
+                    final com.google.gwt.dom.client.Element scrollable = contents
+                            .getFirstChildElement();
+                    final String oldWidth = scrollable.getStyle().getWidth();
+                    final String oldHeight = scrollable.getStyle().getHeight();
+
+                    scrollable.getStyle().setWidth(110, Unit.PCT);
+                    scrollable.getOffsetWidth();
+                    scrollable.getStyle().setProperty("width", oldWidth);
+
+                    scrollable.getStyle().setHeight(110, Unit.PCT);
+                    scrollable.getOffsetHeight();
+                    scrollable.getStyle().setProperty("height", oldHeight);
+
+                    updateContentsSize();
+                    positionOrSizeUpdated();
+                }
+            });
+        }
     }
 
     /** For internal use only. May be removed or replaced in the future. */