FEATURE: new 'automatically_unpin_topics' user preference

app/assets/javascripts/discourse/controllers/topic.js.es6

@@ -645,7 +645,9 @@ export default Ember.Controller.extend(SelectedPostsCount, BufferedContent, {
         topic.set("last_read_post_number", max);
       }
 
-      if (this.siteSettings.automatically_unpin_topics && this.currentUser) {
+      if (this.siteSettings.automatically_unpin_topics &&
+          this.currentUser &&
+          this.currentUser.automatically_unpin_topics) {
         // automatically unpin topics when the user reaches the bottom
         if (topic.get("pinned") && max >= topic.get("highest_post_number")) {
           Em.run.next(() => topic.clearPin());

app/assets/javascripts/discourse/models/user.js.es6

@@ -138,7 +138,8 @@ const User = RestModel.extend({
             'user_fields',
             'muted_usernames',
             'profile_background',
-            'card_background'
+            'card_background',
+            'automatically_unpin_topics'
           );
 
     ['muted','watched','tracked'].forEach(s => {

app/assets/javascripts/discourse/templates/user/preferences.hbs

@@ -237,6 +237,9 @@
 
     <div class="control-group topics">
       <label class="control-label">{{i18n 'categories.topics'}}</label>
+      {{#if siteSettings.automatically_unpin_topics}}
+        {{preference-checkbox labelKey="user.automatically_unpin_topics" checked=model.automatically_unpin_topics}}
+      {{/if}}
       <div class="controls topic-controls">
         <a href="{{unbound model.mutedTopicsPath}}">{{i18n 'user.muted_topics_link'}}</a>
       </div>

app/models/user.rb

@@ -947,6 +947,8 @@ class User < ActiveRecord::Base
     set_default_other_disable_jump_reply
     set_default_other_edit_history_public
 
+    set_default_topics_automatic_unpin
+
     # needed, otherwise the callback chain is broken...
     true
   end
@@ -1030,6 +1032,10 @@ class User < ActiveRecord::Base
     end
   end
 
+  def set_default_topics_automatic_unpin
+    self.automatically_unpin_topics = SiteSetting.default_topics_automatic_unpin
+  end
+
 end
 
 # == Schema Information

app/serializers/user_serializer.rb

@@ -66,7 +66,8 @@ class UserSerializer < BasicUserSerializer
              :user_fields,
              :topic_post_count,
              :pending_count,
-             :profile_view_count
+             :profile_view_count,
+             :automatically_unpin_topics
 
   has_one :invited_by, embed: :object, serializer: BasicUserSerializer
   has_many :custom_groups, embed: :object, serializer: BasicGroupSerializer

app/services/user_updater.rb

@@ -16,7 +16,8 @@ class UserUpdater
     :dynamic_favicon,
     :mailing_list_mode,
     :disable_jump_reply,
-    :edit_history_public
+    :edit_history_public,
+    :automatically_unpin_topics,
   ]
 
   def initialize(actor, user)

config/locales/client.en.yml

@@ -473,6 +473,7 @@ en:
       muted_users: "Muted"
       muted_users_instructions: "Suppress all notifications from these users."
       muted_topics_link: "Show muted topics"
+      automatically_unpin_topics: "Automatically unpin topics when you reach the bottom."
 
       staff_counters:
         flags_given: "helpful flags"

config/locales/server.en.yml

@@ -1242,6 +1242,8 @@ en:
     default_other_disable_jump_reply: "Don't jump to user's post after they reply by default."
     default_other_edit_history_public: "Make the post revisions public by default."
 
+    default_topics_automatic_unpin: "Automatically unpin topics when the user reaches the bottom by default."
+
     default_categories_watching: "List of categories that are watched by default."
     default_categories_tracking: "List of categories that are tracked by default."
     default_categories_muted: "List of categories that are muted by default."

config/site_settings.yml

@@ -1032,6 +1032,10 @@ user_preferences:
   default_other_disable_jump_reply: false
   default_other_edit_history_public: false
 
+  default_topics_automatic_unpin:
+    default: true
+    client: true
+
   default_categories_watching:
     type: category_list
     default: ''

db/migrate/20151117165756_add_automatically_unpin_topics_to_users.rb

@@ -0,0 +1,5 @@
+class AddAutomaticallyUnpinTopicsToUsers < ActiveRecord::Migration
+  def change
+    add_column :users, :automatically_unpin_topics, :boolean, nullabe: false, default: true
+  end
+end

spec/models/user_spec.rb

@@ -1260,6 +1260,8 @@ describe User do
       SiteSetting.stubs(:default_other_disable_jump_reply).returns(true)
       SiteSetting.stubs(:default_other_edit_history_public).returns(true)
 
+      SiteSetting.stubs(:default_topics_automatic_unpin).returns(false)
+
       SiteSetting.stubs(:default_categories_watching).returns("1")
       SiteSetting.stubs(:default_categories_tracking).returns("2")
       SiteSetting.stubs(:default_categories_muted).returns("3")
@@ -1282,6 +1284,8 @@ describe User do
       expect(user.disable_jump_reply).to eq(true)
       expect(user.edit_history_public).to eq(true)
 
+      expect(user.automatically_unpin_topics).to eq(false)
+
       expect(CategoryUser.lookup(user, :watching).pluck(:category_id)).to eq([1])
       expect(CategoryUser.lookup(user, :tracking).pluck(:category_id)).to eq([2])
       expect(CategoryUser.lookup(user, :muted).pluck(:category_id)).to eq([3])