Move removal of threads from catalog to ThreadHiding.hide/show.

This allows the call to ThreadHiding.hide in Filter.quickFilterMD5 to work.

src/Filtering/ThreadHiding.coffee

@@ -183,6 +183,7 @@ ThreadHiding =
     threadRoot = thread.nodes.root
     thread.isHidden = true
     Index.updateHideLabel()
+    $.rm thread.catalogView.nodes.root if thread.catalogView and !Index.showHiddenThreads
 
     return threadRoot.hidden = true unless makeStub
 
@@ -195,3 +196,4 @@ ThreadHiding =
     threadRoot = thread.nodes.root
     threadRoot.hidden = thread.isHidden = false
     Index.updateHideLabel()
+    $.rm thread.catalogView.nodes.root if thread.catalogView and Index.showHiddenThreads

src/General/Index.coffee

@@ -213,7 +213,6 @@ Index =
       e.preventDefault() # Also on mousedown to prevent highlighting text.
 
   toggleHide: (thread) ->
-    $.rm thread.catalogView.nodes.root
     if Index.showHiddenThreads
       ThreadHiding.show thread
       return unless ThreadHiding.db.get {boardID: thread.board.ID, threadID: thread.ID}