Refactor hidden threads count.

It concerns filtered threads too, not just manually hidden threads.

src/Filtering/ThreadHiding.coffee

@@ -24,29 +24,7 @@ ThreadHiding =
       else unless root.contains thread.stub
         # When we come back to a page, the stub is already there.
         ThreadHiding.makeStub thread, root
-    ThreadHiding.updateToggle()
-  updateToggle: ->
-    hiddenCount = 0
-    for threadID, thread of g.BOARD.threads when thread.isHidden
-      hiddenCount++ if thread.ID in Index.liveThreadIDs
-    unless hiddenCount
-      ThreadHiding.removeToggle()
-      return
-    unless ThreadHiding.toggler
-      ThreadHiding.addToggle()
-    $('#hidden-count', Index.navLinks).textContent = if hiddenCount is 1
-      '1 hidden thread'
-    else
-      "#{hiddenCount} hidden threads"
-  addToggle: ->
-    ThreadHiding.toggler = $.el 'span',
-      id: 'hidden-label'
-      innerHTML: ' &mdash; <span id="hidden-count"></span>'
-    $.add Index.navLinks, ThreadHiding.toggler
-  removeToggle: ->
-    return unless ThreadHiding.toggler
-    $.rm ThreadHiding.toggler
-    delete ThreadHiding.toggler
+    return
 
   syncCatalog: ->
     # Sync hidden threads from the catalog into the index.
@@ -179,7 +157,7 @@ ThreadHiding =
     return if thread.isHidden
     threadRoot = thread.OP.nodes.root.parentNode
     thread.isHidden = true
-    ThreadHiding.updateToggle()
+    Index.updateHideToggle()
 
     unless makeStub
       threadRoot.hidden = threadRoot.nextElementSibling.hidden = true # <hr>
@@ -194,4 +172,4 @@ ThreadHiding =
     threadRoot = thread.OP.nodes.root.parentNode
     threadRoot.nextElementSibling.hidden =
       threadRoot.hidden = thread.isHidden = false
-    ThreadHiding.updateToggle()
+    Index.updateHideToggle()

src/General/Index.coffee

@@ -249,6 +249,29 @@ Index =
     $.before a, strong
     $.add strong, a
 
+  updateHideToggle: ->
+    hiddenCount = 0
+    for threadID, thread of g.BOARD.threads when thread.isHidden
+      hiddenCount++ if thread.ID in Index.liveThreadIDs
+    unless hiddenCount
+      Index.removeHideToggle()
+      return
+    unless Index.toggler
+      Index.addHideToggle()
+    $('#hidden-count', Index.navLinks).textContent = if hiddenCount is 1
+      '1 hidden thread'
+    else
+      "#{hiddenCount} hidden threads"
+  addHideToggle: ->
+    Index.toggler = $.el 'span',
+      id: 'hidden-label'
+      innerHTML: ' &mdash; <span id="hidden-count"></span>'
+    $.add Index.navLinks, Index.toggler
+  removeHideToggle: ->
+    return unless Index.toggler
+    $.rm Index.toggler
+    delete Index.toggler
+
   update: (pageNum) ->
     return unless navigator.onLine
     Index.req?.abort()
@@ -367,6 +390,7 @@ Index =
     $.nodes Index.nodes
     Main.callbackNodes Thread, threads
     Main.callbackNodes Post,   posts
+    Index.updateHideToggle()
     $.event 'IndexRefresh'
   buildReplies: (threadRoots) ->
     posts = []