Improve integration of settings from reference.docx.

The settings we can carry over from a reference.docx are
autoHyphenation, consecutiveHyphenLimit, hyphenationZone,
doNotHyphenateCap, evenAndOddHeaders, and proofState.

Previously this was implemented in a buggy way, so that the
reference doc's values AND the new values were included.

This change allows users to create a reference.docx that
sets w:proofState for spelling or grammar to "dirty,"
so that spell/grammar checking will be triggered on the
generated docx.

Closes #1209.

src/Text/Pandoc/Writers/Docx.hs

@@ -469,12 +469,12 @@ writeDocx opts doc = do
   -- adds references to footnotes or endnotes we don't have...
   -- we do, however, copy some settings over from reference
   let settingsPath = "word/settings.xml"
-      settingsList = [ "w:autoHyphenation"
-                     , "w:consecutiveHyphenLimit"
-                     , "w:hyphenationZone"
-                     , "w:doNotHyphenateCap"
-                     , "w:evenAndOddHeaders"
-                     , "w:proofState"
+      settingsList = [ "autoHyphenation"
+                     , "consecutiveHyphenLimit"
+                     , "hyphenationZone"
+                     , "doNotHyphenateCap"
+                     , "evenAndOddHeaders"
+                     , "proofState"
                      ]
   settingsEntry <- copyChildren refArchive distArchive settingsPath epochtime settingsList
 
@@ -577,16 +577,17 @@ copyChildren :: (PandocMonad m)
 copyChildren refArchive distArchive path timestamp elNames = do
   ref  <- parseXml refArchive distArchive path
   dist <- parseXml distArchive distArchive path
+  let elsToCopy =
+        map cleanElem $ filterChildrenName (\e -> qName e `elem` elNames) ref
+  let elsToKeep =
+        [e | Elem e <- elContent dist, not (any (hasSameNameAs e) elsToCopy)]
   return $ toEntry path timestamp $ renderXml dist{
-      elContent = elContent dist ++ copyContent ref
+      elContent = map Elem elsToKeep ++ map Elem elsToCopy
     }
   where
-    strName QName{qName=name, qPrefix=prefix}
-      | Just p <- prefix = p <> ":" <> name
-      | otherwise        = name
-    shouldCopy = (`elem` elNames) . strName
-    cleanElem el@Element{elName=name} = Elem el{elName=name{qURI=Nothing}}
-    copyContent = map cleanElem . filterChildrenName shouldCopy
+    hasSameNameAs (Element {elName = n1}) (Element {elName = n2}) =
+      qName n1 == qName n2
+    cleanElem el@Element{elName=name} = el{elName=name{qURI=Nothing}}
 
 -- this is the lowest number used for a list numId
 baseListId :: Int