b=15509, r=peterl@netscape.com

If the frame has visible content that extends outside its content area,
then the view needs to be marked as having transparent content

layout/base/nsCSSFrameConstructor.cpp

@@ -7141,6 +7141,17 @@ SyncAndInvalidateView(nsIView* aView, nsIFrame* aFrame,
     }
   }
 
+  // If the frame has visible content that overflows the content area, then we
+  // need the view marked as having transparent content
+  if (NS_STYLE_OVERFLOW_VISIBLE == disp->mOverflow) {
+    nsFrameState  frameState;
+
+    aFrame->GetFrameState(&frameState);
+    if (frameState & NS_FRAME_OUTSIDE_CHILDREN) {
+      viewHasTransparentContent = PR_TRUE;
+    }
+  }
+  
   if (viewIsVisible) {
     aViewManager->SetViewContentTransparency(aView, viewHasTransparentContent);
     aViewManager->SetViewVisibility(aView, nsViewVisibility_kShow);

layout/generic/nsFrame.cpp

@@ -1292,6 +1292,14 @@ nsFrame::DidReflow(nsIPresContext& aPresContext,
         }
       }
 
+      // If we have visible content that overflows the content area, then we
+      // need the view marked as having transparent content
+      if (NS_STYLE_OVERFLOW_VISIBLE == display->mOverflow) {
+        if (mState & NS_FRAME_OUTSIDE_CHILDREN) {
+          viewHasTransparentContent = PR_TRUE;
+        }
+      }
+
       // Make sure visibility is correct
       vm->SetViewVisibility(mView, viewIsVisible ? nsViewVisibility_kShow :
                             nsViewVisibility_kHide);

layout/html/base/src/nsFrame.cpp

@@ -1292,6 +1292,14 @@ nsFrame::DidReflow(nsIPresContext& aPresContext,
         }
       }
 
+      // If we have visible content that overflows the content area, then we
+      // need the view marked as having transparent content
+      if (NS_STYLE_OVERFLOW_VISIBLE == display->mOverflow) {
+        if (mState & NS_FRAME_OUTSIDE_CHILDREN) {
+          viewHasTransparentContent = PR_TRUE;
+        }
+      }
+
       // Make sure visibility is correct
       vm->SetViewVisibility(mView, viewIsVisible ? nsViewVisibility_kShow :
                             nsViewVisibility_kHide);

layout/html/style/src/nsCSSFrameConstructor.cpp

@@ -7141,6 +7141,17 @@ SyncAndInvalidateView(nsIView* aView, nsIFrame* aFrame,
     }
   }
 
+  // If the frame has visible content that overflows the content area, then we
+  // need the view marked as having transparent content
+  if (NS_STYLE_OVERFLOW_VISIBLE == disp->mOverflow) {
+    nsFrameState  frameState;
+
+    aFrame->GetFrameState(&frameState);
+    if (frameState & NS_FRAME_OUTSIDE_CHILDREN) {
+      viewHasTransparentContent = PR_TRUE;
+    }
+  }
+  
   if (viewIsVisible) {
     aViewManager->SetViewContentTransparency(aView, viewHasTransparentContent);
     aViewManager->SetViewVisibility(aView, nsViewVisibility_kShow);