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 80bbf1b9c1caa164c41519188afb2ff8c9b8d76d..935c93faba4cdf7ad1669cd5c6132697c0669f2d 100644
--- a/Source/core/frame/FrameView.cpp
+++ b/Source/core/frame/FrameView.cpp
@@ -341,6 +341,19 @@ 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();

[pdr., 2014/12/06 04:17:53]

Just to make sure I understand: we don't need to call
toFrameView(widget)->invalidateAllCustomScrollbarsOnActiveChanged() here because
focusOrActiveStateChanged will already get called on sub-frameviews?

[MuVen, 2014/12/06 13:27:03]

Good Catch !!! thanks, we have to call
invalidateAllCustomScrollbarsOnActiveChanged() here too to invalidate
sub-frameviews. Updated the testcase with iframe, inside iframe.

+        } else if (widget->isScrollbar()) {
+            toScrollbar(widget)->styleChanged();
+        }
+    }
+}
+
 void FrameView::recalculateScrollbarOverlayStyle()
 {
     ScrollbarOverlayStyle oldOverlayStyle = scrollbarOverlayStyle();