Fixed default hint for attribute changed - it wasn't being set.

Special-cased SRC attribute for nsHTMLImageElement.

content/html/content/src/nsGenericHTMLElement.cpp

@@ -1771,6 +1771,8 @@ nsGenericHTMLElement::SetStyleHintForCommonAttributes(const nsIContent* aNode,
     *aHint = NS_STYLE_HINT_VISUAL;
   }
   else {
+    // XXX Make sure we at least set it to something
+    *aHint = NS_STYLE_HINT_REFLOW;
     setHint = PR_FALSE;
   }
   return setHint;

content/html/content/src/nsHTMLImageElement.cpp

@@ -355,6 +355,9 @@ nsHTMLImageElement::GetStyleHintForAttributeChange(
     const nsIAtom* aAttribute,
     PRInt32 *aHint) const
 {
-  nsGenericHTMLElement::SetStyleHintForCommonAttributes(aNode, aAttribute, aHint);
+  if (aAttribute == nsHTMLAtoms::src)
+    *aHint = NS_STYLE_HINT_CONTENT;
+  else
+    nsGenericHTMLElement::SetStyleHintForCommonAttributes(aNode, aAttribute, aHint);
   return NS_OK;
 }

layout/html/content/src/nsGenericHTMLElement.cpp

@@ -1771,6 +1771,8 @@ nsGenericHTMLElement::SetStyleHintForCommonAttributes(const nsIContent* aNode,
     *aHint = NS_STYLE_HINT_VISUAL;
   }
   else {
+    // XXX Make sure we at least set it to something
+    *aHint = NS_STYLE_HINT_REFLOW;
     setHint = PR_FALSE;
   }
   return setHint;

layout/html/content/src/nsHTMLImageElement.cpp

@@ -355,6 +355,9 @@ nsHTMLImageElement::GetStyleHintForAttributeChange(
     const nsIAtom* aAttribute,
     PRInt32 *aHint) const
 {
-  nsGenericHTMLElement::SetStyleHintForCommonAttributes(aNode, aAttribute, aHint);
+  if (aAttribute == nsHTMLAtoms::src)
+    *aHint = NS_STYLE_HINT_CONTENT;
+  else
+    nsGenericHTMLElement::SetStyleHintForCommonAttributes(aNode, aAttribute, aHint);
   return NS_OK;
 }