Bug 906979 - Make it possible again to force spell checking on text controls with spellcheck=false; r=roc

extensions/spellcheck/src/mozInlineSpellChecker.cpp

@@ -65,6 +65,7 @@
 #include "nsEditor.h"
 #include "mozilla/Services.h"
 #include "nsIObserverService.h"
+#include "nsITextControlElement.h"
 
 using namespace mozilla::dom;
 
@@ -1268,6 +1269,21 @@ mozInlineSpellChecker::SkipSpellCheckForNode(nsIEditor* aEditor,
       return NS_OK;
     }
 
+    // Make sure that we can always turn on spell checking for inputs/textareas.
+    // Note that because of the previous check, at this point we know that the
+    // node is editable.
+    if (content->IsInAnonymousSubtree()) {
+      nsCOMPtr<nsIContent> node = content->GetParent();
+      while (node && node->IsInNativeAnonymousSubtree()) {
+        node = node->GetParent();
+      }
+      nsCOMPtr<nsITextControlElement> textControl = do_QueryInterface(node);
+      if (textControl) {
+        *checkSpelling = true;
+        return NS_OK;
+      }
+    }
+
     // Get HTML element ancestor (might be aNode itself, although probably that
     // has to be a text node in real life here)
     nsCOMPtr<nsIDOMHTMLElement> htmlElement = do_QueryInterface(content);