Clarify when ReParentStyleContext should be called and remove more bogus style

parentage warnings.  Bug 217225, r+sr=dbaron

layout/base/nsCSSFrameConstructor.cpp

@@ -2802,9 +2802,8 @@ nsCSSFrameConstructor::ConstructTableColFrame(nsIPresShell*            aPresShel
   rv = aTableCreator.CreateTableColFrame(&aNewFrame); if (NS_FAILED(rv)) return rv;
   InitAndRestoreFrame(aPresContext, aState, aContent, parentFrame, aStyleContext, nsnull, aNewFrame);
   // if the parent frame was anonymous then reparent the style context
-  nsStyleContext* parentStyleContext = parentFrame->GetStyleContext();
   if (aIsPseudoParent) {
-    aPresContext->ReParentStyleContext(aNewFrame, parentStyleContext);
+    aPresContext->ReParentStyleContext(aNewFrame, parentFrame->GetStyleContext());
   }
 
   // construct additional col frames if the col frame has a span > 1
@@ -11678,8 +11677,8 @@ ReparentFrame(nsIPresContext* aPresContext,
               nsStyleContext* aParentStyleContext,
               nsIFrame* aFrame)
 {
-  aPresContext->ReParentStyleContext(aFrame, aParentStyleContext);
   aFrame->SetParent(aNewParentFrame);
+  aPresContext->ReParentStyleContext(aFrame, aParentStyleContext);
 }
 
 // Special routine to handle placing a list of frames into a block

layout/base/nsFrameManager.cpp

@@ -1463,10 +1463,8 @@ FrameManager::ReParentStyleContext(nsIFrame* aFrame,
   NS_ENSURE_TRUE(mPresShell, NS_ERROR_NOT_AVAILABLE);
   nsresult result = NS_ERROR_NULL_POINTER;
   if (aFrame) {
-#ifdef NS_DEBUG
+    // DO NOT verify the style tree before reparenting.  The frame
-    DebugVerifyStyleTree(aFrame);
+    // tree has already been changed, so this check would just fail.
-#endif
-
     nsStyleContext* oldContext = aFrame->GetStyleContext();
     if (oldContext) {
       nsIPresContext *presContext = GetPresContext();
@@ -1529,7 +1527,7 @@ FrameManager::ReParentStyleContext(nsIFrame* aFrame,
               break;
             }
           }
-#ifdef NS_DEBUG
+#ifdef DEBUG
           VerifyStyleTree(GetPresContext(), aFrame, aNewParentContext);
 #endif
         }

layout/base/nsPresContext.h

@@ -253,7 +253,9 @@ public:
 
   /** 
    * For a given frame tree, get a new style context that is the equivalent
-   * but within a new parent
+   * but within a new parent.  The StyleContextParent of aFrame should be
+   * changed _before_ this method is called, so that style tree verification
+   * can take place correctly.
    */
   NS_IMETHOD ReParentStyleContext(nsIFrame* aFrame, 
                                   nsStyleContext* aNewParentContext) = 0;

layout/base/public/nsIFrameManager.h

@@ -140,7 +140,9 @@ public:
   NS_IMETHOD NotifyDestroyingFrame(nsIFrame* aFrame) = 0;
 
   // reparent the style contexts of this frame sub tree to live under the
-  // new given parent style context
+  // new given parent style context.  The StyleContextParent of aFrame
+  // should be changed _before_ this method is called, so that style tree
+  // verification can take place correctly.
   NS_IMETHOD ReParentStyleContext(nsIFrame* aFrame, 
                                   nsStyleContext* aNewParentContext) = 0;
 

layout/base/public/nsIPresContext.h

@@ -253,7 +253,9 @@ public:
 
   /** 
    * For a given frame tree, get a new style context that is the equivalent
-   * but within a new parent
+   * but within a new parent.  The StyleContextParent of aFrame should be
+   * changed _before_ this method is called, so that style tree verification
+   * can take place correctly.
    */
   NS_IMETHOD ReParentStyleContext(nsIFrame* aFrame, 
                                   nsStyleContext* aNewParentContext) = 0;

layout/base/public/nsPresContext.h

@@ -253,7 +253,9 @@ public:
 
   /** 
    * For a given frame tree, get a new style context that is the equivalent
-   * but within a new parent
+   * but within a new parent.  The StyleContextParent of aFrame should be
+   * changed _before_ this method is called, so that style tree verification
+   * can take place correctly.
    */
   NS_IMETHOD ReParentStyleContext(nsIFrame* aFrame, 
                                   nsStyleContext* aNewParentContext) = 0;

layout/generic/nsFirstLetterFrame.cpp

@@ -158,8 +158,8 @@ nsFirstLetterFrame::SetInitialChildList(nsIPresContext* aPresContext,
                                         nsIFrame*       aChildList)
 {
   mFrames.SetFrames(aChildList);
-  if (aChildList) {
+  for (nsIFrame* frame = aChildList; frame; frame = frame->GetNextSibling()) {
-    aPresContext->ReParentStyleContext(aChildList, mStyleContext);
+    aPresContext->ReParentStyleContext(frame, mStyleContext);
   }
   return NS_OK;
 }

layout/generic/nsInlineFrame.cpp

@@ -993,8 +993,8 @@ nsFirstLineFrame::Reflow(nsIPresContext* aPresContext,
     if (prevOverflowFrames) {
       nsFrameList frames(prevOverflowFrames);
       
-      ReParentChildListStyle(aPresContext, mStyleContext, frames);
       mFrames.InsertFrames(this, nsnull, prevOverflowFrames);
+      ReParentChildListStyle(aPresContext, mStyleContext, frames);
     }
   }
 
@@ -1004,8 +1004,8 @@ nsFirstLineFrame::Reflow(nsIPresContext* aPresContext,
     NS_ASSERTION(mFrames.NotEmpty(), "overflow list w/o frames");
     nsFrameList frames(overflowFrames);
 
-    ReParentChildListStyle(aPresContext, mStyleContext, frames);
     mFrames.AppendFrames(nsnull, overflowFrames);
+    ReParentChildListStyle(aPresContext, mStyleContext, frames);
   }
 
   // Set our own reflow state (additional state above and beyond

layout/html/base/src/nsFirstLetterFrame.cpp

@@ -158,8 +158,8 @@ nsFirstLetterFrame::SetInitialChildList(nsIPresContext* aPresContext,
                                         nsIFrame*       aChildList)
 {
   mFrames.SetFrames(aChildList);
-  if (aChildList) {
+  for (nsIFrame* frame = aChildList; frame; frame = frame->GetNextSibling()) {
-    aPresContext->ReParentStyleContext(aChildList, mStyleContext);
+    aPresContext->ReParentStyleContext(frame, mStyleContext);
   }
   return NS_OK;
 }

layout/html/base/src/nsFrameManager.cpp

@@ -1463,10 +1463,8 @@ FrameManager::ReParentStyleContext(nsIFrame* aFrame,
   NS_ENSURE_TRUE(mPresShell, NS_ERROR_NOT_AVAILABLE);
   nsresult result = NS_ERROR_NULL_POINTER;
   if (aFrame) {
-#ifdef NS_DEBUG
+    // DO NOT verify the style tree before reparenting.  The frame
-    DebugVerifyStyleTree(aFrame);
+    // tree has already been changed, so this check would just fail.
-#endif
-
     nsStyleContext* oldContext = aFrame->GetStyleContext();
     if (oldContext) {
       nsIPresContext *presContext = GetPresContext();
@@ -1529,7 +1527,7 @@ FrameManager::ReParentStyleContext(nsIFrame* aFrame,
               break;
             }
           }
-#ifdef NS_DEBUG
+#ifdef DEBUG
           VerifyStyleTree(GetPresContext(), aFrame, aNewParentContext);
 #endif
         }

layout/html/base/src/nsInlineFrame.cpp

@@ -993,8 +993,8 @@ nsFirstLineFrame::Reflow(nsIPresContext* aPresContext,
     if (prevOverflowFrames) {
       nsFrameList frames(prevOverflowFrames);
       
-      ReParentChildListStyle(aPresContext, mStyleContext, frames);
       mFrames.InsertFrames(this, nsnull, prevOverflowFrames);
+      ReParentChildListStyle(aPresContext, mStyleContext, frames);
     }
   }
 
@@ -1004,8 +1004,8 @@ nsFirstLineFrame::Reflow(nsIPresContext* aPresContext,
     NS_ASSERTION(mFrames.NotEmpty(), "overflow list w/o frames");
     nsFrameList frames(overflowFrames);
 
-    ReParentChildListStyle(aPresContext, mStyleContext, frames);
     mFrames.AppendFrames(nsnull, overflowFrames);
+    ReParentChildListStyle(aPresContext, mStyleContext, frames);
   }
 
   // Set our own reflow state (additional state above and beyond

layout/html/style/src/nsCSSFrameConstructor.cpp

@@ -2802,9 +2802,8 @@ nsCSSFrameConstructor::ConstructTableColFrame(nsIPresShell*            aPresShel
   rv = aTableCreator.CreateTableColFrame(&aNewFrame); if (NS_FAILED(rv)) return rv;
   InitAndRestoreFrame(aPresContext, aState, aContent, parentFrame, aStyleContext, nsnull, aNewFrame);
   // if the parent frame was anonymous then reparent the style context
-  nsStyleContext* parentStyleContext = parentFrame->GetStyleContext();
   if (aIsPseudoParent) {
-    aPresContext->ReParentStyleContext(aNewFrame, parentStyleContext);
+    aPresContext->ReParentStyleContext(aNewFrame, parentFrame->GetStyleContext());
   }
 
   // construct additional col frames if the col frame has a span > 1
@@ -11678,8 +11677,8 @@ ReparentFrame(nsIPresContext* aPresContext,
               nsStyleContext* aParentStyleContext,
               nsIFrame* aFrame)
 {
-  aPresContext->ReParentStyleContext(aFrame, aParentStyleContext);
   aFrame->SetParent(aNewParentFrame);
+  aPresContext->ReParentStyleContext(aFrame, aParentStyleContext);
 }
 
 // Special routine to handle placing a list of frames into a block