Read posts won't be marked as unread after reloading a thread.

Organize changelog.
Interrupt the watch task when a file has been saved.

4chan_x.user.js

@@ -836,6 +836,26 @@
     open: function(url) {
       return (GM_openInTab || window.open)(url, '_blank');
     },
+    debounce: function(wait, fn) {
+      var args, exec, that, timeout;
+      timeout = null;
+      that = null;
+      args = null;
+      exec = function() {
+        fn.apply(that, args);
+        return timeout = null;
+      };
+      return function() {
+        args = arguments;
+        that = this;
+        if (timeout) {
+          clearTimeout(timeout);
+        } else {
+          exec();
+        }
+        return timeout = setTimeout(exec, wait);
+      };
+    },
     queueTask: (function() {
       var execTask, taskChannel, taskQueue;
       taskQueue = [];
@@ -4926,6 +4946,10 @@
     },
     node: function() {
       var ID, post, posts, _ref;
+      Unread.thread = this;
+      Unread.lastReadPost = $.get("lastReadPosts." + this.board, {
+        threads: {}
+      }).threads[this] || 0;
       Unread.yourPosts = [];
       Unread.posts = [];
       Unread.title = d.title;
@@ -4938,26 +4962,26 @@
         }
       }
       Unread.addPosts(posts);
-      Unread.update();
       $.on(d, 'ThreadUpdate', Unread.onUpdate);
       $.on(d, 'QRPostSuccessful', Unread.post);
       return $.on(d, 'scroll visibilitychange', Unread.read);
     },
     addPosts: function(newPosts) {
-      var post, _i, _len, _ref;
+      var ID, post, _i, _len;
       for (_i = 0, _len = newPosts.length; _i < _len; _i++) {
         post = newPosts[_i];
-        if (!((_ref = post.ID, __indexOf.call(Unread.yourPosts, _ref) >= 0) || post.isHidden)) {
+        ID = post.ID;
+        if (!(ID <= Unread.lastReadPost || post.isHidden || __indexOf.call(Unread.yourPosts, ID) >= 0)) {
           Unread.posts.push(post);
         }
       }
-      return Unread.read();
+      Unread.read();
+      return Unread.update();
     },
     onUpdate: function(e) {
       if (!e.detail[404]) {
-        Unread.addPosts(e.detail.newPosts);
+        return Unread.addPosts(e.detail.newPosts);
       }
-      return Unread.update();
     },
     post: function(e) {
       return Unread.yourPosts.push(+e.detail.postID);
@@ -4979,11 +5003,21 @@
       if (!i) {
         return;
       }
+      Unread.lastReadPost = Unread.posts[i - 1].ID;
+      Unread.saveLastReadPost();
       Unread.posts = Unread.posts.slice(i);
       if (e) {
         return Unread.update();
       }
     },
+    saveLastReadPost: $.debounce($.SECOND, function() {
+      var lastReadPosts;
+      lastReadPosts = $.get("lastReadPosts." + Unread.thread.board, {
+        threads: {}
+      });
+      lastReadPosts.threads[Unread.thread] = Unread.lastReadPost;
+      return $.set("lastReadPosts." + Unread.thread.board, lastReadPosts);
+    }),
     update: function() {
       var count;
       count = Unread.posts.length;

Gruntfile.js

@@ -60,15 +60,20 @@ module.exports = function(grunt) {
       }
     },
     watch: {
-      files: [
-        'package.json',
-        'lib/**/*.coffee',
-        'src/**/*.coffee',
-        'src/**/*.js',
-        'css/**/*.css',
-        'img/*'
-      ],
-      tasks: 'default'
+      all: {
+        options: {
+          interrupt: true
+        },
+        files: [
+          'package.json',
+          'lib/**/*.coffee',
+          'src/**/*.coffee',
+          'src/**/*.js',
+          'css/**/*.css',
+          'img/*'
+        ],
+        tasks: 'default'
+      }
     },
     clean: {
       tmp: 'tmp'

changelog

@@ -1,6 +1,7 @@
-alpha
+beta
 - Mayhem
   Major rewrite of 4chan X.
+
   New feature, the Header:
     Access the list of boards directly from the Header.
     From the Header's menu, access to:
@@ -8,21 +9,31 @@ alpha
       Quick Reply shortcut
       Image Expansion
     Can be auto-hidden.
+
   QR changes:
     Creating threads outside of the index is now possible.
     Selection-to-quote also applies to selected text inside the post, not just inside the comment.
     Quoting the OP will not insert the >>opnumber anymore unless the QR was already opened.
+
   Image Expansion changes:
     Expanding OP images won't squish replies anymore.
     There is now a setting to allow expanding spoilers.
+
+  Thread Updater changes:
+    The Thread Updater will pause when offline, and resume when online.
+    Added an option to always auto-scroll to the bottom.
+
+  Unread posts changes:
+    Read posts won't be marked as unread after reloading a thread.
+    Visible posts will not be taken into account towards the unread count.
+
+  Thread/Post Hiding changes:
+    Added Thread & Post Hiding in the Menu, with individual settings.
+    Thread & Post Hiding Buttons can now be disabled in the settings.
+    Recursive Hiding will be automatically applied when manually hiding a post.
+
   Added touch and multi-touch support for dragging windows.
-  The Thread Updater will pause when offline, and resume when online.
-  Added an option to always auto-scroll to the bottom.
   Thread Stats post and file count will adjust with deleted posts.
-  Added Thread & Post Hiding in the Menu, with individual settings.
-  Thread & Post Hiding Buttons can now be disabled in the settings.
-  Recursive Hiding will be automatically applied when manually hiding a post.
-  Visible posts will not be taken into account towards the unread count.
   Added [math] tags keybind.
   Fix Chrome's install warning saying that 4chan X would execute on all domains.
   Fix Quote Backlinks not affecting inlined quotes.

lib/$.coffee

@@ -139,6 +139,24 @@ $.extend $,
     root.dispatchEvent new CustomEvent event, {bubbles: true, detail}
   open: (url) ->
     (GM_openInTab or window.open) url, '_blank'
+  debounce: (wait, fn) ->
+    timeout = null
+    that    = null
+    args    = null
+    exec    = ->
+      fn.apply that, args
+      timeout = null
+    ->
+      args = arguments
+      that = this
+      if timeout
+        # stop current reset
+        clearTimeout timeout
+      else
+        exec()
+
+      # after wait, let next invocation execute immediately
+      timeout = setTimeout exec, wait
   queueTask: do ->
     # inspired by https://www.w3.org/Bugs/Public/show_bug.cgi?id=15007
     taskQueue = []

src/features.coffee

@@ -3293,28 +3293,30 @@ Unread =
       cb:   @node
 
   node: ->
-    Unread.yourPosts = []
-    Unread.posts     = []
-    Unread.title     = d.title
+    Unread.thread       = @
+    Unread.lastReadPost = $.get("lastReadPosts.#{@board}", threads: {}).threads[@] or 0
+    Unread.yourPosts    = []
+    Unread.posts        = []
+    Unread.title        = d.title
     posts = []
     for ID, post of @posts
       posts.push post if post.isReply
     Unread.addPosts posts
-    Unread.update()
     $.on d, 'ThreadUpdate',            Unread.onUpdate
     $.on d, 'QRPostSuccessful',        Unread.post
     $.on d, 'scroll visibilitychange', Unread.read
 
   addPosts: (newPosts) ->
     for post in newPosts
-      unless post.ID in Unread.yourPosts or post.isHidden
+      {ID} = post
+      unless ID <= Unread.lastReadPost or post.isHidden or ID in Unread.yourPosts
         Unread.posts.push post
     Unread.read()
+    Unread.update()
 
   onUpdate: (e) ->
     unless e.detail[404]
       Unread.addPosts e.detail.newPosts
-    Unread.update()
 
   post: (e) ->
     Unread.yourPosts.push +e.detail.postID
@@ -3327,9 +3329,17 @@ Unread =
       break if bottom > height # post is not completely read
     return unless i
 
+    Unread.lastReadPost = Unread.posts[i - 1].ID
+    Unread.saveLastReadPost()
     Unread.posts = Unread.posts[i..]
     Unread.update() if e
 
+  saveLastReadPost: $.debounce($.SECOND, ->
+    lastReadPosts = $.get "lastReadPosts.#{Unread.thread.board}", threads: {}
+    lastReadPosts.threads[Unread.thread] = Unread.lastReadPost
+    $.set "lastReadPosts.#{Unread.thread.board}", lastReadPosts
+  )
+
   update: ->
     count = Unread.posts.length