Support filters that apply to multiple post fields joined by newline characters.

src/Filtering/Filter.coffee

@@ -92,8 +92,7 @@ Filter =
         # Fields that this filter applies to (for 'general' filters)
         if key is 'general'
           if (types = filter.match /(?:^|;)\s*type:([^;]*)/)
-            types = types[1].split(',').filter (x) ->
+            types = types[1].split(',')
-              x of Config.filter and x isnt 'general'
           else
             types = ['subject', 'name', 'filename', 'comment']
 
@@ -181,7 +180,10 @@ Filter =
     MD5:        (post) -> post.file?.MD5
 
   value: (key, post) ->
-    Filter.valueF[key](post)
+    if key of Filter.valueF
+      Filter.valueF[key](post)
+    else
+      key.split('+').map((k) -> Filter.valueF[k]?(post) or '').join('\n')
 
   addFilter: (type, re, cb) ->
     $.get type, Conf[type], (item) ->

src/General/Settings/Filter-guide.html

@@ -41,7 +41,9 @@
   <li>
     Filters in the "General" section apply to multiple fields, by default <code>subject,name,filename,comment</code>.<br>
     The fields can be specified with the <code>type</code> option, separated by commas.<br>
-    For example: <code>type:@{filterTypes};</code>.
+    For example: <code>type:@{filterTypes};</code>.<br>
+    Types can also be combined with a <code>+</code> sign; this indicates the filter applies to the given fields joined by newlines.<br>
+    For example: <code>type:filename+filesize+dimensions;</code>.<br>
   </li>
 </ul>
 <p>