Consolidate code to test whether image has been redirected to archive yet.

src/Images/Gallery.coffee

@@ -194,7 +194,7 @@ Gallery =
   error: ->
     if @error?.code is MediaError.MEDIA_ERR_DECODE
       return new Notice 'error', 'Corrupt or unplayable video', 30
-    return unless @src.split('/')[2] is 'i.4cdn.org'
+    return if ImageCommon.isFromArchive @
     ImageCommon.error @, g.posts[@dataset.post], null, (url) =>
       return unless url
       Gallery.images[@dataset.id].href = url

src/Images/ImageCommon.coffee

@@ -33,6 +33,9 @@ ImageCommon =
     message.textContent = 'Error: Corrupt or unplayable video'
     return true
 
+  isFromArchive: (file) ->
+    file.src.split('/')[2] isnt 'i.4cdn.org'
+
   error: (file, post, delay, cb) ->
     src = post.file.url.split '/'
     URL = Redirect.to 'file', {
@@ -42,12 +45,12 @@ ImageCommon =
     unless Conf['404 Redirect'] and URL and Redirect.securityCheck URL
       URL = null
 
-    return cb URL if (post.isDead or post.file.isDead) and file.src.split('/')[2] is 'i.4cdn.org'
+    return cb URL if (post.isDead or post.file.isDead) and not ImageCommon.isFromArchive file
 
     timeoutID = setTimeout (-> cb URL), delay if delay?
     return if post.isDead or post.file.isDead
     redirect = ->
-      if file.src.split('/')[2] is 'i.4cdn.org'
+      unless ImageCommon.isFromArchive file
         clearTimeout timeoutID if delay?
         cb URL
 

src/Images/ImageExpand.coffee

@@ -268,7 +268,7 @@ ImageExpand =
     if ImageCommon.decodeError @, post
       return ImageExpand.contract post
     # Don't autoretry images from the archive.
-    unless @src.split('/')[2] is 'i.4cdn.org'
+    if ImageCommon.isFromArchive @
       return ImageExpand.contract post
     ImageCommon.error @, post, 10 * $.SECOND, (URL) ->
       if post.file.isExpanding or post.file.isExpanded