options to enable scrollbars and disable sticky headers

src/components/settings_modal/tabs/general_tab.vue

@@ -60,6 +60,16 @@
             {{ $t('settings.virtual_scrolling') }}
           </BooleanSetting>
         </li>
+        <li>
+          <BooleanSetting path="disableStickyHeaders">
+            {{ $t('settings.disable_sticky_headers') }}
+          </BooleanSetting>
+        </li>
+        <li>
+          <BooleanSetting path="showScrollbars">
+            {{ $t('settings.show_scrollbars') }}
+          </BooleanSetting>
+        </li>
         <li>
           <BooleanSetting
             path="alwaysShowNewPostButton"

src/components/timeline/timeline.js

@@ -91,7 +91,7 @@ const Timeline = {
     const credentials = store.state.users.currentUser.credentials
     const showImmediately = this.timeline.visibleStatuses.length === 0
 
-    scroller().addEventListener('scroll', this.handleScroll)
+    scroller() && scroller().addEventListener('scroll', this.handleScroll)
 
     if (store.state.api.fetchers[this.timelineName]) { return false }