Set tooltips to have default boundary viewport

app/assets/javascripts/diff_notes/diff_notes_bundle.js

@@ -69,9 +69,10 @@ export default () => {
 
   gl.diffNotesCompileComponents();
 
-  if (!hasVueMRDiscussionsCookie()) {
+  const resolveCountAppEl = document.querySelector('#resolve-count-app');
+  if (!hasVueMRDiscussionsCookie() && resolveCountAppEl) {
     new Vue({
-      el: '#resolve-count-app',
+      el: resolveCountAppEl,
       components: {
         'resolve-count': ResolveCount
       },

app/assets/javascripts/main.js

@@ -144,6 +144,7 @@ document.addEventListener('DOMContentLoaded', () => {
   $body.tooltip({
     selector: '.has-tooltip, [data-toggle="tooltip"]',
     trigger: 'hover',
+    boundary: 'viewport',
     placement(tip, el) {
       return $(el).data('placement') || 'bottom';
     },

spec/support/features/reportable_note_shared_examples.rb

@@ -1,6 +1,7 @@
 require 'spec_helper'
 
 shared_examples 'reportable note' do |type|
+  include MobileHelpers
   include NotesHelper
 
   let(:comment) { find("##{ActionView::RecordIdentifier.dom_id(note)}") }
@@ -39,6 +40,9 @@ shared_examples 'reportable note' do |type|
   end
 
   def open_dropdown(dropdown)
+    # make window wide enough that tooltip doesn't trigger horizontal scrollbar
+    resize_window(1200, 800)
+
     dropdown.find('.more-actions-toggle').click
     dropdown.find('.dropdown-menu li', match: :first)
   end