Trigger style recalc when the window's active state change

Source/core/frame/FrameView.cpp

Index: Source/core/frame/FrameView.cpp
diff --git a/Source/core/frame/FrameView.cpp b/Source/core/frame/FrameView.cpp
index fead2c37d5aef382869754e821fde1e16084b94b..05596e8bc20c3739146e092c82bc2f259a144670 100644
--- a/Source/core/frame/FrameView.cpp
+++ b/Source/core/frame/FrameView.cpp
@@ -341,6 +341,23 @@ void FrameView::recalculateCustomScrollbarStyle()
     }
 }
 
+void FrameView::invalidateAllCustomScrollbarsOnActiveChanged()
+{
+    const ChildrenWidgetSet* viewChildren = children();
+    for (const RefPtrWillBeMember<Widget>& child : *viewChildren) {
+        Widget* widget = child.get();
+        if (widget->isFrameView()) {
+            toFrameView(widget)->recalculateCustomScrollbarStyle();
+            toFrameView(widget)->invalidateAllCustomScrollbarsOnActiveChanged();
+        } else if (widget->isScrollbar()) {
+            toScrollbar(widget)->styleChanged();
+            updateScrollbarGeometry();

[MuVen, 2014/12/09 11:29:48]

This snippet was missed. If RootFrameView has CustomScrollbar and its style has
been changed then ScrollbarGeometry needs to be updated. I missed out that.

[rune, 2014/12/09 11:41:33]

I'm not an expert on scrollbar widgets, but doesn't this code call
updateScrollbarGeometry on the FrameView for every scrollbar in every overflow
container in that FrameView as well?

+            updateScrollCorner();
+            positionScrollbarLayers();
+        }
+    }
+}
+
 void FrameView::recalculateScrollbarOverlayStyle()
 {
     ScrollbarOverlayStyle oldOverlayStyle = scrollbarOverlayStyle();