Don't create a widget if the view already has one and check error return code from CreateViewForFrame(). b=374102 r+sr=roc

layout/xul/base/src/nsBoxFrame.cpp

@@ -199,13 +199,15 @@ nsBoxFrame::Init(nsIContent*      aContent,
                  nsIFrame*        aPrevInFlow)
 {
   nsresult  rv = nsContainerFrame::Init(aContent, aParent, aPrevInFlow);
+  NS_ENSURE_SUCCESS(rv, rv);
 
   MarkIntrinsicWidthsDirty();
 
   // see if we need a widget
   if (aParent && aParent->IsBoxFrame()) {
     if (aParent->ChildrenMustHaveWidgets()) {
-        nsHTMLContainerFrame::CreateViewForFrame(this, nsnull, PR_TRUE);
+        rv = nsHTMLContainerFrame::CreateViewForFrame(this, nsnull, PR_TRUE);
+        NS_ENSURE_SUCCESS(rv, rv);
 
         nsIView* view = GetView();
         if (!view->HasWidget())

layout/xul/base/src/nsLeafBoxFrame.cpp

@@ -97,13 +97,15 @@ nsLeafBoxFrame::Init(
               nsIFrame*        aPrevInFlow)
 {
   nsresult  rv = nsLeafFrame::Init(aContent, aParent, aPrevInFlow);
+  NS_ENSURE_SUCCESS(rv, rv);
 
    // see if we need a widget
   if (aParent && aParent->IsBoxFrame()) {
     if (aParent->ChildrenMustHaveWidgets()) {
-        nsHTMLContainerFrame::CreateViewForFrame(this, nsnull, PR_TRUE); 
-        nsIView* view = GetView();
+        rv = nsHTMLContainerFrame::CreateViewForFrame(this, nsnull, PR_TRUE); 
+        NS_ENSURE_SUCCESS(rv, rv);
 
+        nsIView* view = GetView();
         if (!view->HasWidget())
            view->CreateWidget(kWidgetCID);   
     }

layout/xul/base/src/nsMenuPopupFrame.cpp

@@ -156,6 +156,7 @@ nsMenuPopupFrame::Init(nsIContent*      aContent,
                        nsIFrame*        aPrevInFlow)
 {
   nsresult rv = nsBoxFrame::Init(aContent, aParent, aPrevInFlow);
+  NS_ENSURE_SUCCESS(rv, rv);
 
   // Set up a mediator which can be used for callbacks on this frame.
   mTimerMediator = new nsMenuPopupTimerMediator(this);
@@ -171,7 +172,8 @@ nsMenuPopupFrame::Init(nsIContent*      aContent,
     GetMetric(nsILookAndFeel::eMetric_MenusCanOverlapOSBar, tempBool);
   mMenuCanOverlapOSBar = tempBool;
 
-  CreateViewForFrame(presContext, this, GetStyleContext(), PR_TRUE);
+  rv = CreateViewForFrame(presContext, this, GetStyleContext(), PR_TRUE);
+  NS_ENSURE_SUCCESS(rv, rv);
 
   // Now that we've made a view, remove it and insert it at the correct
   // position in the view hierarchy (as the root view).  We do this so that we

layout/xul/base/src/nsSplitterFrame.cpp

@@ -358,16 +358,21 @@ nsSplitterFrame::Init(nsIContent*      aContent,
   }
 
   nsresult  rv = nsBoxFrame::Init(aContent, aParent, aPrevInFlow);
+  NS_ENSURE_SUCCESS(rv, rv);
 
-  nsHTMLContainerFrame::CreateViewForFrame(this, nsnull, PR_TRUE);
-  nsIView* view = GetView();
+  rv = nsHTMLContainerFrame::CreateViewForFrame(this, nsnull, PR_TRUE);
+  NS_ENSURE_SUCCESS(rv, rv);
 
   if (!realTimeDrag) {
+    nsIView* view = GetView();
     // currently this only works on win32 and mac
     static NS_DEFINE_CID(kCChildCID, NS_CHILD_CID);
 
     // Need to have a widget to appear on top of other widgets.
-    view->CreateWidget(kCChildCID);
+    NS_ASSERTION(!view->HasWidget(), "have an unwanted widget");
+    if (!view->HasWidget()) {
+      view->CreateWidget(kCChildCID);
+    }
   }
 
   mInner->mState = nsSplitterFrameInner::Open;

layout/xul/base/src/tree/src/nsTreeBodyFrame.cpp

@@ -207,8 +207,15 @@ nsTreeBodyFrame::Init(nsIContent*     aContent,
                       nsIFrame*       aPrevInFlow)
 {
   nsresult rv = nsLeafBoxFrame::Init(aContent, aParent, aPrevInFlow);
-  nsBoxFrame::CreateViewForFrame(PresContext(), this, GetStyleContext(), PR_TRUE);
-  nsLeafBoxFrame::GetView()->CreateWidget(kWidgetCID);
+  NS_ENSURE_SUCCESS(rv, rv);
+
+  rv = nsBoxFrame::CreateViewForFrame(PresContext(), this, GetStyleContext(), PR_TRUE);
+  NS_ENSURE_SUCCESS(rv, rv);
+
+  nsIView* view = nsLeafBoxFrame::GetView();
+  if (!view->HasWidget()) {
+    view->CreateWidget(kWidgetCID);
+  }
 
   mIndentation = GetIndentation();
   mRowHeight = GetRowHeight();