Add tree-style thread display

src/components/settings_modal/tabs/general_tab.js

@@ -20,6 +20,11 @@ const GeneralTab = {
         value: mode,
         label: this.$t(`settings.subject_line_${mode === 'masto' ? 'mastodon' : mode}`)
       })),
+      conversationDisplayOptions: ['tree', 'linear'].map(mode => ({
+        key: mode,
+        value: mode,
+        label: this.$t(`settings.conversation_display_${mode}`)
+      })),
       mentionLinkDisplayOptions: ['short', 'full_for_remote', 'full'].map(mode => ({
         key: mode,
         value: mode,

src/components/settings_modal/tabs/general_tab.vue

@@ -152,6 +152,15 @@
             {{ $t('settings.show_yous') }}
           </BooleanSetting>
         </li>
+        <li>
+          <ChoiceSetting
+            id="conversationDisplay"
+            path="conversationDisplay"
+            :options="conversationDisplayOptions"
+          >
+            {{ $t('settings.conversation_display') }}
+          </ChoiceSetting>
+        </li>
         <li>
           <ChoiceSetting
             id="mentionLinkDisplay"