Dereference dead threads.

I wonder if this will be enough...

CHANGELOG.md

@@ -1,5 +1,5 @@
 Index navigation improvements:
- - You can now refresh the index page you are on with the same keybind for refreshing threads.
+ - You can now refresh the index page you are on with the icon in the header bar or the same keybind for refreshing threads.
  - You can now switch between single-page and all-pages navigation via the "Index Navigation" header sub-menu.
 Added a keybind to open the catalog search field on index pages.
 

src/General/Post.coffee

@@ -193,6 +193,13 @@ class Post
         quotelink.textContent = quotelink.textContent.replace '\u00A0(Dead)', ''
         $.rmClass quotelink, 'deadlink'
     return
+
+  collect: ->
+    @kill()
+    delete g.posts[@fullID]
+    delete @thread.posts[@]
+    delete @board.posts[@]
+
   addClone: (context) ->
     new Clone @, context
   rmClone: (index) ->

src/General/Thread.coffee

@@ -11,3 +11,9 @@ class Thread
   kill: ->
     @isDead = true
     @timeOfDeath = Date.now()
+
+  collect: ->
+    for postID, post in @posts
+      post.collect()
+    delete g.threads[@fullID]
+    delete @board.threads[@]

src/Miscellaneous/Index.coffee

@@ -84,15 +84,17 @@ Index =
       for page in pages
         dataThr.push page.threads...
 
-    nodes   = []
-    threads = []
-    posts   = []
+    nodes       = []
+    threads     = []
+    liveThreads = []
+    posts       = []
     for data in dataThr
       threadRoot = Build.thread g.BOARD, data
       nodes.push threadRoot, $.el 'hr'
       unless thread = g.threads["#{g.BOARD}.#{data.no}"]
         thread = new Thread data.no, g.BOARD
         threads.push thread
+      liveThreads.push thread
       for postRoot in $$ '.thread > .postContainer', threadRoot
         continue if thread.posts[postRoot.id.match /\d+/]
         try
@@ -106,6 +108,7 @@ Index =
             error: err
     Main.handleErrors errors if errors
 
+    Index.collectDeadThreads liveThreads
     # Add the threads and <hr>s in a container to make sure all features work.
     $.nodes nodes
     Main.callbackNodes Thread, threads
@@ -128,3 +131,8 @@ Index =
       arr = nodes.splice nodes.indexOf(top), 2
       nodes.splice i * 2, 0, arr...
     nodes
+
+  collectDeadThreads: (liveThreads) ->
+    for threadID, thread of g.threads when thread not in liveThreads
+      thread.collect()
+    return