Bugs 27947, 27271. Re-order content-model-to-layout notification to avoid an incremental reflow. This ensures that 1) all menus will be completely created before they are displayed, and 2) the 'oncreate' handler runs after RDF content has been generated. r=hyatt

content/xul/document/src/nsXULDocument.cpp

@@ -1416,19 +1416,9 @@ nsXULDocument::AttributeChanged(nsIContent* aElement,
         if (NS_FAILED(rv)) return rv;
     }
 
-    // Now notify external observers
-    for (PRInt32 i = 0; i < mObservers.Count(); i++) {
-        nsIDocumentObserver*  observer = (nsIDocumentObserver*)mObservers[i];
-        observer->AttributeChanged(this, aElement, aNameSpaceID, aAttribute, aHint);
-        if (observer != (nsIDocumentObserver*)mObservers.ElementAt(i)) {
-            i--;
-        }
-    }
-
-    // Handle "special" cases. We do this handling _after_ we've
-    // notified the observer to ensure that any frames that are
-    // caching information (e.g., the tree widget and the 'open'
-    // attribute) will notice things properly.
+    // Handle "open" and "close" cases. We do this handling before
+    // we've notified the observer, so that content is already created
+    // for the frame system to walk.
     if ((nameSpaceID == kNameSpaceID_XUL) && (aAttribute == kOpenAtom)) {
         nsAutoString open;
         rv = aElement->GetAttribute(kNameSpaceID_None, kOpenAtom, open);
@@ -1441,7 +1431,20 @@ nsXULDocument::AttributeChanged(nsIContent* aElement,
             CloseWidgetItem(aElement);
         }
     }
-    else if (aAttribute == kRefAtom) {
+
+    // Now notify external observers
+    for (PRInt32 i = 0; i < mObservers.Count(); i++) {
+        nsIDocumentObserver*  observer = (nsIDocumentObserver*)mObservers[i];
+        observer->AttributeChanged(this, aElement, aNameSpaceID, aAttribute, aHint);
+        if (observer != (nsIDocumentObserver*)mObservers.ElementAt(i)) {
+            i--;
+        }
+    }
+
+    // Check for a change to the 'ref' attribute on an atom, in which
+    // case we may need to nuke and rebuild the entire content model
+    // beneath the element.
+    if (aAttribute == kRefAtom) {
         RebuildWidgetItem(aElement);
     }
 

content/xul/templates/src/nsXULTemplateBuilder.cpp

@@ -771,7 +771,9 @@ RDFGenericBuilderImpl::OpenContainer(nsIContent* aElement)
     rv = CreateContainerContents(aElement, resource, PR_FALSE, getter_AddRefs(container), &newIndex);
     if (NS_FAILED(rv)) return rv;
 
-    if (container) {
+    if (container && IsTreeWidgetItem(aElement)) {
+        // The tree widget is special, and has to be spanked every
+        // time we add content to a container.
         nsCOMPtr<nsIDocument> doc = do_QueryInterface(mDocument);
         if (! doc)
             return NS_ERROR_UNEXPECTED;
@@ -2462,22 +2464,11 @@ RDFGenericBuilderImpl::CreateContainerContents(nsIContent* aElement,
         *aNewIndexInContainer = -1;
     }
 
-    // If it's XUL, then see if the item is even "open" (HTML content
-    // must be generated eagerly). If not, then just pretend it
-    // doesn't have _any_ contents. We check this _before_ checking
-    // the contents-generated attribute so that we don't eagerly set
-    // contents-generated on a closed node.
-    {
-        PRInt32 nameSpaceID;
-        rv = aElement->GetNameSpaceID(nameSpaceID);
-        NS_ASSERTION(NS_SUCCEEDED(rv), "unable to get namespace ID");
-        if (NS_FAILED(rv)) return rv;
-
-        if (nameSpaceID == kNameSpaceID_XUL) {
-            if (! IsOpen(aElement))
+    // The tree widget is special. If the item isn't open, then just
+    // "pretend" that there aren't any contents here. We'll create
+    // them when OpenContainer() gets called.
+    if (IsTreeWidgetItem(aElement) && !IsOpen(aElement))
         return NS_OK;
-        }
-    }
 
     // See if the element's templates contents have been generated:
     // this prevents a re-entrant call from triggering another

rdf/content/src/nsRDFGenericBuilder.cpp

@@ -771,7 +771,9 @@ RDFGenericBuilderImpl::OpenContainer(nsIContent* aElement)
     rv = CreateContainerContents(aElement, resource, PR_FALSE, getter_AddRefs(container), &newIndex);
     if (NS_FAILED(rv)) return rv;
 
-    if (container) {
+    if (container && IsTreeWidgetItem(aElement)) {
+        // The tree widget is special, and has to be spanked every
+        // time we add content to a container.
         nsCOMPtr<nsIDocument> doc = do_QueryInterface(mDocument);
         if (! doc)
             return NS_ERROR_UNEXPECTED;
@@ -2462,22 +2464,11 @@ RDFGenericBuilderImpl::CreateContainerContents(nsIContent* aElement,
         *aNewIndexInContainer = -1;
     }
 
-    // If it's XUL, then see if the item is even "open" (HTML content
-    // must be generated eagerly). If not, then just pretend it
-    // doesn't have _any_ contents. We check this _before_ checking
-    // the contents-generated attribute so that we don't eagerly set
-    // contents-generated on a closed node.
-    {
-        PRInt32 nameSpaceID;
-        rv = aElement->GetNameSpaceID(nameSpaceID);
-        NS_ASSERTION(NS_SUCCEEDED(rv), "unable to get namespace ID");
-        if (NS_FAILED(rv)) return rv;
-
-        if (nameSpaceID == kNameSpaceID_XUL) {
-            if (! IsOpen(aElement))
+    // The tree widget is special. If the item isn't open, then just
+    // "pretend" that there aren't any contents here. We'll create
+    // them when OpenContainer() gets called.
+    if (IsTreeWidgetItem(aElement) && !IsOpen(aElement))
         return NS_OK;
-        }
-    }
 
     // See if the element's templates contents have been generated:
     // this prevents a re-entrant call from triggering another

rdf/content/src/nsXULDocument.cpp

@@ -1416,19 +1416,9 @@ nsXULDocument::AttributeChanged(nsIContent* aElement,
         if (NS_FAILED(rv)) return rv;
     }
 
-    // Now notify external observers
-    for (PRInt32 i = 0; i < mObservers.Count(); i++) {
-        nsIDocumentObserver*  observer = (nsIDocumentObserver*)mObservers[i];
-        observer->AttributeChanged(this, aElement, aNameSpaceID, aAttribute, aHint);
-        if (observer != (nsIDocumentObserver*)mObservers.ElementAt(i)) {
-            i--;
-        }
-    }
-
-    // Handle "special" cases. We do this handling _after_ we've
-    // notified the observer to ensure that any frames that are
-    // caching information (e.g., the tree widget and the 'open'
-    // attribute) will notice things properly.
+    // Handle "open" and "close" cases. We do this handling before
+    // we've notified the observer, so that content is already created
+    // for the frame system to walk.
     if ((nameSpaceID == kNameSpaceID_XUL) && (aAttribute == kOpenAtom)) {
         nsAutoString open;
         rv = aElement->GetAttribute(kNameSpaceID_None, kOpenAtom, open);
@@ -1441,7 +1431,20 @@ nsXULDocument::AttributeChanged(nsIContent* aElement,
             CloseWidgetItem(aElement);
         }
     }
-    else if (aAttribute == kRefAtom) {
+
+    // Now notify external observers
+    for (PRInt32 i = 0; i < mObservers.Count(); i++) {
+        nsIDocumentObserver*  observer = (nsIDocumentObserver*)mObservers[i];
+        observer->AttributeChanged(this, aElement, aNameSpaceID, aAttribute, aHint);
+        if (observer != (nsIDocumentObserver*)mObservers.ElementAt(i)) {
+            i--;
+        }
+    }
+
+    // Check for a change to the 'ref' attribute on an atom, in which
+    // case we may need to nuke and rebuild the entire content model
+    // beneath the element.
+    if (aAttribute == kRefAtom) {
         RebuildWidgetItem(aElement);
     }
 

rdf/content/src/nsXULTemplateBuilder.cpp

@@ -771,7 +771,9 @@ RDFGenericBuilderImpl::OpenContainer(nsIContent* aElement)
     rv = CreateContainerContents(aElement, resource, PR_FALSE, getter_AddRefs(container), &newIndex);
     if (NS_FAILED(rv)) return rv;
 
-    if (container) {
+    if (container && IsTreeWidgetItem(aElement)) {
+        // The tree widget is special, and has to be spanked every
+        // time we add content to a container.
         nsCOMPtr<nsIDocument> doc = do_QueryInterface(mDocument);
         if (! doc)
             return NS_ERROR_UNEXPECTED;
@@ -2462,22 +2464,11 @@ RDFGenericBuilderImpl::CreateContainerContents(nsIContent* aElement,
         *aNewIndexInContainer = -1;
     }
 
-    // If it's XUL, then see if the item is even "open" (HTML content
-    // must be generated eagerly). If not, then just pretend it
-    // doesn't have _any_ contents. We check this _before_ checking
-    // the contents-generated attribute so that we don't eagerly set
-    // contents-generated on a closed node.
-    {
-        PRInt32 nameSpaceID;
-        rv = aElement->GetNameSpaceID(nameSpaceID);
-        NS_ASSERTION(NS_SUCCEEDED(rv), "unable to get namespace ID");
-        if (NS_FAILED(rv)) return rv;
-
-        if (nameSpaceID == kNameSpaceID_XUL) {
-            if (! IsOpen(aElement))
+    // The tree widget is special. If the item isn't open, then just
+    // "pretend" that there aren't any contents here. We'll create
+    // them when OpenContainer() gets called.
+    if (IsTreeWidgetItem(aElement) && !IsOpen(aElement))
         return NS_OK;
-        }
-    }
 
     // See if the element's templates contents have been generated:
     // this prevents a re-entrant call from triggering another