Add 'Show thread' button to posts with reply tree

app/controllers/settings/preferences_controller.rb

@@ -68,6 +68,7 @@ class Settings::PreferencesController < Settings::BaseController
       :setting_show_target,
       :setting_enable_limited_timeline,
       :setting_enable_reaction,
+      :setting_show_reply_tree_button,
       notification_emails: %i(follow follow_request reblog favourite emoji_reaction mention digest report pending_account trending_tag),
       interactions: %i(must_be_follower must_be_following must_be_following_dm)
     )

app/javascript/mastodon/components/status_content.js

@@ -6,7 +6,7 @@ import Permalink from './permalink';
 import classnames from 'classnames';
 import PollContainer from 'mastodon/containers/poll_container';
 import Icon from 'mastodon/components/icon';
-import { autoPlayGif } from 'mastodon/initial_state';
+import { autoPlayGif, show_reply_tree_button } from 'mastodon/initial_state';
 
 const MAX_HEIGHT = 642; // 20px * 32 (+ 2px padding at the top)
 
@@ -193,7 +193,10 @@ export default class StatusContent extends React.PureComponent {
 
     const hidden = this.props.onExpandedToggle ? !this.props.expanded : this.state.hidden;
     const renderReadMore = this.props.onClick && status.get('collapsed');
-    const renderViewThread = this.props.showThread && status.get('in_reply_to_id') && status.get('in_reply_to_account_id') === status.getIn(['account', 'id']);
+    const renderViewThread = this.props.showThread && (
+      status.get('in_reply_to_id') && status.get('in_reply_to_account_id') === status.getIn(['account', 'id']) ||
+      show_reply_tree_button && (status.get('in_reply_to_id') || !!status.get('replies_count'))
+    );
     const renderShowPoll = !!status.get('poll');
 
     const content = { __html: status.get('contentHtml') };

app/javascript/mastodon/initial_state.js

@@ -40,5 +40,6 @@ export const place_tab_bar_at_bottom = getMeta('place_tab_bar_at_bottom');
 export const show_tab_bar_label = getMeta('show_tab_bar_label');
 export const enable_limited_timeline = getMeta('enable_limited_timeline');
 export const enableReaction = getMeta('enable_reaction');
+export const show_reply_tree_button = getMeta('show_reply_tree_button');
 
 export default initialState;

app/javascript/mastodon/reducers/statuses.js

@@ -25,7 +25,12 @@ import { TIMELINE_DELETE } from '../actions/timelines';
 import { STATUS_IMPORT, STATUSES_IMPORT } from '../actions/importer';
 import { Map as ImmutableMap, fromJS } from 'immutable';
 
-const importStatus = (state, status) => state.set(status.id, fromJS(status));
+const importStatus = (state, status) => {
+  if (state.getIn([status.in_reply_to_id, 'replies_count'], null) == 0) {
+    state = state.setIn([status.in_reply_to_id, 'replies_count'], 1);
+  }
+  return state.set(status.id, fromJS(status));
+};
 
 const importStatuses = (state, statuses) =>
   state.withMutations(mutable => statuses.forEach(status => importStatus(mutable, status)));

app/lib/user_settings_decorator.rb

@@ -52,6 +52,7 @@ class UserSettingsDecorator
     user.settings['show_tab_bar_label']                = show_tab_bar_label_preference if change?('setting_show_tab_bar_label')
     user.settings['enable_limited_timeline']           = enable_limited_timeline_preference if change?('setting_enable_limited_timeline')
     user.settings['enable_reaction']                   = enable_reaction_preference if change?('setting_enable_reaction')
+    user.settings['show_reply_tree_button']            = show_reply_tree_button_preference if change?('setting_show_reply_tree_button')
   end
 
   def merged_notification_emails
@@ -202,6 +203,10 @@ class UserSettingsDecorator
     boolean_cast_setting 'setting_enable_reaction'
   end
 
+  def show_reply_tree_button_preference
+    boolean_cast_setting 'setting_show_reply_tree_button'
+  end
+
   def boolean_cast_setting(key)
     ActiveModel::Type::Boolean.new.cast(settings[key])
   end

app/models/user.rb

@@ -130,6 +130,7 @@ class User < ApplicationRecord
            :show_follow_button_on_timeline, :show_subscribe_button_on_timeline, :show_followed_by, :show_target,
            :follow_button_to_list_adder, :show_navigation_panel, :show_quote_button, :show_bookmark_button,
            :place_tab_bar_at_bottom,:show_tab_bar_label, :enable_limited_timeline, :enable_reaction,
+           :show_reply_tree_button,
 
            to: :settings, prefix: :setting, allow_nil: false
 

app/serializers/initial_state_serializer.rb

@@ -54,6 +54,7 @@ class InitialStateSerializer < ActiveModel::Serializer
       store[:show_tab_bar_label]                = object.current_account.user.setting_show_tab_bar_label
       store[:enable_limited_timeline]           = object.current_account.user.setting_enable_limited_timeline
       store[:enable_reaction]                   = object.current_account.user.setting_enable_reaction
+      store[:show_reply_tree_button]            = object.current_account.user.setting_show_reply_tree_button
     else
       store[:auto_play_gif] = Setting.auto_play_gif
       store[:display_media] = Setting.display_media

app/views/settings/preferences/other/show.html.haml

@@ -66,6 +66,9 @@
   .fields-group
     = f.input :setting_enable_reaction, as: :boolean, wrapper: :with_label
 
+  .fields-group
+    = f.input :setting_show_reply_tree_button, as: :boolean, wrapper: :with_label
+
   -# .fields-group
   -#   = f.input :setting_show_target, as: :boolean, wrapper: :with_label
 

config/locales/simple_form.en.yml

@@ -62,6 +62,7 @@ en:
         setting_show_follow_button_on_timeline: You can easily check the follow status and build a follow list quickly
         setting_show_navigation_panel: Show the navigation panel at the right end of the advanced UI
         setting_show_quote_button: Selects whether to display the button on the action bar. It does not enable/disable the citation function.
+        setting_show_reply_tree_button: When turned off, the "Show thread" button will only appear if the poster is replying to themselves in a series of posts
         setting_show_subscribe_button_on_timeline: You can easily check the status of your subscriptions and quickly build a subscription list
         setting_show_tab_bar_label: When adding a list etc. to the tab bar, it is recommended to display the label because it is not possible to distinguish by the icon alone
         setting_show_followed_by: "The color of the follow button changes according to the follow status (gray: no follow relationship, yellow: followed, blue: following, green: mutual follow)"
@@ -201,6 +202,7 @@ en:
         setting_show_follow_button_on_timeline: Show follow button on timeline
         setting_show_navigation_panel: Show the navigation panel
         setting_show_quote_button: Show the quote button on the action bar
+        setting_show_reply_tree_button: Show "Show thread" button on posts that have reply tree
         setting_show_subscribe_button_on_timeline: Show subscribe button on timeline
         setting_show_tab_bar_label: Show labels in the tab bar
         setting_show_followed_by: Reflect the following status on the follow button

config/locales/simple_form.ja.yml

@@ -62,6 +62,7 @@ ja:
         setting_show_follow_button_on_timeline: フォロー状態を確認し易くなり、素早くフォローリストを構築できます
         setting_show_navigation_panel: 上級者向け UI の右端にナビゲーションパネルを表示します
         setting_show_quote_button: アクションバーへボタンを表示するかどうかの設定です。引用機能の有効・無効を切り替えるものではありません
+        setting_show_reply_tree_button: オフにした場合、投稿者本人が自分自身にリプライで投稿を連ねている場合にのみ『スレッドを表示』ボタンが表示されます
         setting_show_subscribe_button_on_timeline: 購読状態を確認し易くなり、素早く購読リストを構築できます
         setting_show_tab_bar_label: リスト等をタブバーに追加する場合、アイコンだけでは区別がつかないので、ラベルを表示することをおすすめします
         setting_show_followed_by: フォロー状態に応じてフォローボタンの色が変わります（灰色：フォロー関係なし、黄色：フォローされている、青色：フォローしている、緑色：相互フォロー）
@@ -201,6 +202,7 @@ ja:
         setting_show_follow_button_on_timeline: タイムライン上にフォローボタンを表示する
         setting_show_navigation_panel: ナビゲーションパネルを表示する
         setting_show_quote_button: 引用ボタンをアクションバーに表示する
+        setting_show_reply_tree_button: リプライツリーの存在する投稿に『スレッドを表示』ボタンを表示する
         setting_show_subscribe_button_on_timeline: タイムライン上に購読ボタンを表示する
         setting_show_tab_bar_label: タブバーにラベルを表示する
         setting_show_followed_by: 被フォロー状態をフォローボタンに反映する

config/settings.yml

@@ -51,6 +51,7 @@ defaults: &defaults
   show_tab_bar_label: false
   enable_limited_timeline: false
   enable_reaction: true
+  show_reply_tree_button: true
   notification_emails:
     follow: false
     reblog: false