Add threads to the QR thread selector when you view a quoted post from one of them.

An accidental feature that I'm making work consistently.

src/General/Config.coffee

@@ -353,7 +353,7 @@ Config =
       ]
       'Show New Thread Option in Threads': [
         false
-        'Show the option to post a new thread from inside a thread.'
+        'Show the option to post a new / different thread from inside a thread.'
       ]
       'Show Name and Subject': [
         false

src/Posting/QR.coffee

@@ -94,6 +94,7 @@ QR =
 
   node: ->
     $.on @nodes.quote, 'click', QR.quote
+    QR.generatePostableThreadsList() if @isFetchedQuote
 
   open: ->
     if QR.nodes