EPUB Reader: Fixed regressions in image extraction

Before the images were relative to the position of the package file. The
collapse function changed this so that they were then absolute in the
archive but the fetchImages function wasn't updated to recognise this.

src/Text/Pandoc/Readers/EPUB.hs

@@ -62,7 +62,7 @@ archiveToEPUB (setEPUBOptions -> os) archive = do
       foldM' (\a b -> ((a <>) . bottomUp (prependHash escapedSpine))
         `liftM` parseSpineElem root b) mempty spine
   let ast = coverDoc <> (Pandoc meta bs)
-  let mediaBag = fetchImages (M.elems items) root archive ast
+  let mediaBag = fetchImages (M.elems items) archive ast
   return $ (ast, mediaBag)
   where
     parseSpineElem :: MonadError String m => FilePath -> (FilePath, MIME) -> m Pandoc
@@ -89,19 +89,19 @@ setEPUBOptions os = os''
     os'  = os {readerExtensions = foldr S.insert rs [Ext_epub_html_exts]}
     os'' = os' {readerParseRaw = True}
 
+-- paths should be absolute when this function is called
+-- renameImages should do this
 fetchImages :: [(FilePath, MIME)]
-            -> FilePath
             -> Archive
             -> Pandoc
             -> MediaBag
-fetchImages mimes root arc (query iq -> links) =
+fetchImages mimes arc (query iq -> links) =
     foldr (uncurry3 insertMedia) mempty
       (mapMaybe getEntry links)
   where
-    getEntry (normalise -> l) =
-      let mediaPos = normalise (root </> l) in
-        (l , lookup mediaPos mimes, ) . fromEntry
-          <$> findEntryByPath mediaPos arc
+    getEntry link =
+        (link , lookup link mimes, ) . fromEntry
+          <$> findEntryByPath link arc
 
 iq :: Inline -> [FilePath]
 iq (Image _ (url, _)) = [url]