Merge remote-tracking branch 'upstream/master' into ce-to-ee-2018-10-02

# Conflicts:
#	app/assets/javascripts/projects/project_new.js
#	spec/finders/issues_finder_spec.rb

[ci skip]

Gemfile.lock

@@ -758,7 +758,7 @@ GEM
     retriable (3.1.2)
     rinku (2.0.0)
     rotp (2.1.2)
-    rouge (3.2.1)
+    rouge (3.3.0)
     rqrcode (0.7.0)
       chunky_png
     rqrcode-rails3 (0.1.7)

Gemfile.rails5.lock

@@ -767,7 +767,7 @@ GEM
     retriable (3.1.2)
     rinku (2.0.0)
     rotp (2.1.2)
-    rouge (3.2.1)
+    rouge (3.3.0)
     rqrcode (0.7.0)
       chunky_png
     rqrcode-rails3 (0.1.7)

app/assets/javascripts/boards/index.js

@@ -22,6 +22,7 @@ import './components/board_sidebar';
 import './components/new_list_dropdown';
 import BoardAddIssuesModal from './components/modal/index.vue';
 import '~/vue_shared/vue_resource_interceptor';
+import { NavigationType } from '~/lib/utils/common_utils';
 
 import 'ee/boards/models/list';
 import 'ee/boards/models/issue';
@@ -42,6 +43,16 @@ export default () => {
 
   window.gl = window.gl || {};
 
+  // check for browser back and trigger a hard reload to circumvent browser caching.
+  window.addEventListener('pageshow', (event) => {
+    const isNavTypeBackForward = window.performance &&
+        window.performance.navigation.type === NavigationType.TYPE_BACK_FORWARD;
+
+    if (event.persisted || isNavTypeBackForward) {
+      window.location.reload();
+    }
+  });
+
   if (gl.IssueBoardsApp) {
     gl.IssueBoardsApp.$destroy(true);
   }

app/assets/javascripts/lazy_loader.js

@@ -2,54 +2,114 @@ import _ from 'underscore';
 
 export const placeholderImage =
   'data:image/gif;base64,R0lGODlhAQABAAAAACH5BAEKAAEALAAAAAABAAEAAAICTAEAOw==';
-const SCROLL_THRESHOLD = 300;
+const SCROLL_THRESHOLD = 500;
 
 export default class LazyLoader {
   constructor(options = {}) {
+    this.intersectionObserver = null;
     this.lazyImages = [];
     this.observerNode = options.observerNode || '#content-body';
 
-    const throttledScrollCheck = _.throttle(() => this.scrollCheck(), 300);
-    const debouncedElementsInView = _.debounce(() => this.checkElementsInView(), 300);
-
-    window.addEventListener('scroll', throttledScrollCheck);
-    window.addEventListener('resize', debouncedElementsInView);
-
     const scrollContainer = options.scrollContainer || window;
-    scrollContainer.addEventListener('load', () => this.loadCheck());
+    scrollContainer.addEventListener('load', () => this.register());
+  }
+
+  static supportsIntersectionObserver() {
+    return 'IntersectionObserver' in window;
   }
+
   searchLazyImages() {
-    const that = this;
     requestIdleCallback(
       () => {
-        that.lazyImages = [].slice.call(document.querySelectorAll('.lazy'));
+        const lazyImages = [].slice.call(document.querySelectorAll('.lazy'));
 
-        if (that.lazyImages.length) {
-          that.checkElementsInView();
+        if (LazyLoader.supportsIntersectionObserver()) {
+          if (this.intersectionObserver) {
+            lazyImages.forEach(img => this.intersectionObserver.observe(img));
+          }
+        } else if (lazyImages.length) {
+          this.lazyImages = lazyImages;
+          this.checkElementsInView();
         }
       },
       { timeout: 500 },
     );
   }
+
   startContentObserver() {
     const contentNode = document.querySelector(this.observerNode) || document.querySelector('body');
-
     if (contentNode) {
-      const observer = new MutationObserver(() => this.searchLazyImages());
+      this.mutationObserver = new MutationObserver(() => this.searchLazyImages());
 
-      observer.observe(contentNode, {
+      this.mutationObserver.observe(contentNode, {
         childList: true,
         subtree: true,
       });
     }
   }
-  loadCheck() {
-    this.searchLazyImages();
+
+  stopContentObserver() {
+    if (this.mutationObserver) {
+      this.mutationObserver.takeRecords();
+      this.mutationObserver.disconnect();
+      this.mutationObserver = null;
+    }
+  }
+
+  unregister() {
+    this.stopContentObserver();
+    if (this.intersectionObserver) {
+      this.intersectionObserver.takeRecords();
+      this.intersectionObserver.disconnect();
+      this.intersectionObserver = null;
+    }
+    if (this.throttledScrollCheck) {
+      window.removeEventListener('scroll', this.throttledScrollCheck);
+    }
+    if (this.debouncedElementsInView) {
+      window.removeEventListener('resize', this.debouncedElementsInView);
+    }
+  }
+
+  register() {
+    if (LazyLoader.supportsIntersectionObserver()) {
+      this.startIntersectionObserver();
+    } else {
+      this.startLegacyObserver();
+    }
     this.startContentObserver();
+    this.searchLazyImages();
   }
+
+  startIntersectionObserver = () => {
+    this.throttledElementsInView = _.throttle(() => this.checkElementsInView(), 300);
+    this.intersectionObserver = new IntersectionObserver(this.onIntersection, {
+      rootMargin: `${SCROLL_THRESHOLD}px 0px`,
+      thresholds: 0.1,
+    });
+  };
+
+  onIntersection = entries => {
+    entries.forEach(entry => {
+      if (entry.isIntersecting) {
+        this.intersectionObserver.unobserve(entry.target);
+        this.lazyImages.push(entry.target);
+      }
+    });
+    this.throttledElementsInView();
+  };
+
+  startLegacyObserver() {
+    this.throttledScrollCheck = _.throttle(() => this.scrollCheck(), 300);
+    this.debouncedElementsInView = _.debounce(() => this.checkElementsInView(), 300);
+    window.addEventListener('scroll', this.throttledScrollCheck);
+    window.addEventListener('resize', this.debouncedElementsInView);
+  }
+
   scrollCheck() {
     requestAnimationFrame(() => this.checkElementsInView());
   }
+
   checkElementsInView() {
     const scrollTop = window.pageYOffset;
     const visHeight = scrollTop + window.innerHeight + SCROLL_THRESHOLD;
@@ -61,18 +121,29 @@ export default class LazyLoader {
         const imgTop = scrollTop + imgBoundRect.top;
         const imgBound = imgTop + imgBoundRect.height;
 
-        if (scrollTop < imgBound && visHeight > imgTop) {
+        if (scrollTop <= imgBound && visHeight >= imgTop) {
           requestAnimationFrame(() => {
             LazyLoader.loadImage(selectedImage);
           });
           return false;
         }
 
+        /*
+        If we are scrolling fast, the img we watched intersecting could have left the view port.
+        So we are going watch for new intersections.
+        */
+        if (LazyLoader.supportsIntersectionObserver()) {
+          if (this.intersectionObserver) {
+            this.intersectionObserver.observe(selectedImage);
+          }
+          return false;
+        }
         return true;
       }
       return false;
     });
   }
+
   static loadImage(img) {
     if (img.getAttribute('data-src')) {
       let imgUrl = img.getAttribute('data-src');

app/assets/javascripts/lib/utils/common_utils.js

@@ -616,6 +616,17 @@ export const roundOffFloat = (number, precision = 0) => {
   return Math.round(number * multiplier) / multiplier;
 };
 
+/**
+ * Represents navigation type constants of the Performance Navigation API.
+ * Detailed explanation see https://developer.mozilla.org/en-US/docs/Web/API/PerformanceNavigation.
+ */
+export const NavigationType = {
+  TYPE_NAVIGATE: 0,
+  TYPE_RELOAD: 1,
+  TYPE_BACK_FORWARD: 2,
+  TYPE_RESERVED: 255,
+};
+
 window.gl = window.gl || {};
 window.gl.utils = {
   ...(window.gl.utils || {}),

app/assets/javascripts/projects/project_new.js

@@ -147,12 +147,15 @@ const bindEvents = () => {
 
   $projectImportUrl.keyup(() => deriveProjectPathFromUrl($projectImportUrl));
 
+<<<<<<< HEAD
   $('.js-import-git-toggle-button').on('click', () => {
     const $projectMirror = $('#project_mirror');
 
     $projectMirror.attr('disabled', !$projectMirror.attr('disabled'));
   });
 
+=======
+>>>>>>> upstream/master
   $projectName.on('keyup change', () => {
     onProjectNameChange($projectName, $projectPath);
     hasUserDefinedProjectPath = $projectPath.val().trim().length > 0;

app/finders/issuable_finder.rb

@@ -236,16 +236,16 @@ class IssuableFinder
   # rubocop: enable CodeReuse/ActiveRecord
 
   def assignee_id?
-    params[:assignee_id].present? && params[:assignee_id] != NONE
+    params[:assignee_id].present? && params[:assignee_id].to_s != NONE
   end
 
   def assignee_username?
-    params[:assignee_username].present? && params[:assignee_username] != NONE
+    params[:assignee_username].present? && params[:assignee_username].to_s != NONE
   end
 
   def no_assignee?
     # Assignee_id takes precedence over assignee_username
-    params[:assignee_id] == NONE || params[:assignee_username] == NONE
+    params[:assignee_id].to_s == NONE || params[:assignee_username].to_s == NONE
   end
 
   # rubocop: disable CodeReuse/ActiveRecord

changelogs/unreleased/-50928-stale-list-of-issues-on-board-after-click-back.yml

+---
+title: Fix stale issue boards after browser back
+merge_request: 22006
+author: Johann Hubert Sonntagbauer
+type: fixed

changelogs/unreleased/35476-lazy-image-intersectionobserver.yml

+---
+title: Improve lazy image loading performance by using IntersectionObserver where
+  available
+merge_request: 21565
+author:
+type: performance

changelogs/unreleased/41205-fix-filtering-issues.yml

+---
+title: Filter issues without an Assignee via the API
+merge_request: 22009
+author: Eva Kadlecová
+type: fixed

changelogs/unreleased/rouge-3-3-0.yml

+---
+title: Update to Rouge 3.3.0 including frozen string literals for improved memory
+  usage
+merge_request:
+author:
+type: changed

doc/development/changelog.md

@@ -110,7 +110,8 @@ At this point the script would ask you to select the category of the change (map
 4. New deprecation
 5. Feature removal
 6. Security fix
-7. Other
+7. Performance improvement
+8. Other
 ```
 
 The entry filename is based on the name of the current Git branch. If you run

spec/features/boards/reload_boards_on_browser_back_spec.rb

+require 'rails_helper'
+
+describe 'Ensure Boards do not show stale data on browser back', :js do
+  let(:project) {create(:project, :public)}
+  let(:board)   {create(:board, project: project)}
+  let(:user)    {create(:user)}
+
+  context 'authorized user' do
+    before do
+      project.add_maintainer(user)
+
+      sign_in(user)
+
+      visit project_board_path(project, board)
+      wait_for_requests
+
+      page.within(first('.board .issue-count-badge-count')) do
+        expect(page).to have_content('0')
+      end
+    end
+
+    it 'created issue is listed on board' do
+      visit new_project_issue_path(project)
+      wait_for_requests
+
+      fill_in 'issue_title', with: 'issue should be shown'
+
+      click_button 'Submit issue'
+
+      page.go_back
+      wait_for_requests
+
+      page.go_back
+      wait_for_requests
+
+      page.within(first('.board .issue-count-badge-count')) do
+        expect(page).to have_content('1')
+      end
+
+      page.within(first('.board-card')) do
+        issue = project.issues.find_by_title('issue should be shown')
+
+        expect(page).to have_content(issue.to_reference)
+        expect(page).to have_link(issue.title, href: issue_path(issue))
+      end
+    end
+  end
+end

spec/finders/issues_finder_spec.rb

@@ -72,6 +72,7 @@ describe IssuesFinder do
         end
       end
 
+<<<<<<< HEAD
       context 'filtering by assignee IDs' do
         set(:user3) { create(:user) }
         let(:params) { { assignee_ids: [user2.id, user3.id] } }
@@ -99,6 +100,13 @@ describe IssuesFinder do
 
         it 'returns issues assigned to those users' do
           expect(issues).to contain_exactly(issue3)
+=======
+      context 'filtering by no assignee' do
+        let(:params) { { assignee_id: 0 } }
+
+        it 'returns issues not assign to any assignee' do
+          expect(issues).to contain_exactly(issue4)
+>>>>>>> upstream/master
         end
       end
 

spec/javascripts/lazy_loader_spec.js

 import LazyLoader from '~/lazy_loader';
+import { TEST_HOST } from './test_constants';
 
 let lazyLoader = null;
 
+const execImmediately = callback => {
+  callback();
+};
+
 describe('LazyLoader', function() {
   preloadFixtures('issues/issue_with_comment.html.raw');
 
-  beforeEach(function() {
-    loadFixtures('issues/issue_with_comment.html.raw');
-    lazyLoader = new LazyLoader({
-      observerNode: 'body',
+  describe('with IntersectionObserver disabled', () => {
+    beforeEach(function() {
+      loadFixtures('issues/issue_with_comment.html.raw');
+
+      lazyLoader = new LazyLoader({
+        observerNode: 'foobar',
+      });
+
+      spyOn(LazyLoader, 'supportsIntersectionObserver').and.callFake(() => false);
+
+      spyOn(LazyLoader, 'loadImage').and.callThrough();
+
+      spyOn(window, 'requestAnimationFrame').and.callFake(execImmediately);
+      spyOn(window, 'requestIdleCallback').and.callFake(execImmediately);
+
+      // Doing everything that happens normally in onload
+      lazyLoader.register();
+    });
+
+    afterEach(() => {
+      lazyLoader.unregister();
+    });
+
+    it('should copy value from data-src to src for img 1', function(done) {
+      const img = document.querySelectorAll('img[data-src]')[0];
+      const originalDataSrc = img.getAttribute('data-src');
+      img.scrollIntoView();
+
+      setTimeout(() => {
+        expect(LazyLoader.loadImage).toHaveBeenCalled();
+        expect(img.getAttribute('src')).toBe(originalDataSrc);
+        expect(img).toHaveClass('js-lazy-loaded');
+        done();
+      }, 50);
+    });
+
+    it('should lazy load dynamically added data-src images', function(done) {
+      const newImg = document.createElement('img');
+      const testPath = `${TEST_HOST}/img/testimg.png`;
+      newImg.className = 'lazy';
+      newImg.setAttribute('data-src', testPath);
+      document.body.appendChild(newImg);
+      newImg.scrollIntoView();
+
+      setTimeout(() => {
+        expect(LazyLoader.loadImage).toHaveBeenCalled();
+        expect(newImg.getAttribute('src')).toBe(testPath);
+        expect(newImg).toHaveClass('js-lazy-loaded');
+        done();
+      }, 50);
+    });
+
+    it('should not alter normal images', function(done) {
+      const newImg = document.createElement('img');
+      const testPath = `${TEST_HOST}/img/testimg.png`;
+      newImg.setAttribute('src', testPath);
+      document.body.appendChild(newImg);
+      newImg.scrollIntoView();
+
+      setTimeout(() => {
+        expect(LazyLoader.loadImage).not.toHaveBeenCalled();
+        expect(newImg).not.toHaveClass('js-lazy-loaded');
+        done();
+      }, 50);
+    });
+
+    it('should not load dynamically added pictures if content observer is turned off', done => {
+      lazyLoader.stopContentObserver();
+
+      const newImg = document.createElement('img');
+      const testPath = `${TEST_HOST}/img/testimg.png`;
+      newImg.className = 'lazy';
+      newImg.setAttribute('data-src', testPath);
+      document.body.appendChild(newImg);
+      newImg.scrollIntoView();
+
+      setTimeout(() => {
+        expect(LazyLoader.loadImage).not.toHaveBeenCalled();
+        expect(newImg).not.toHaveClass('js-lazy-loaded');
+        done();
+      }, 50);
+    });
+
+    it('should load dynamically added pictures if content observer is turned off and on again', done => {
+      lazyLoader.stopContentObserver();
+      lazyLoader.startContentObserver();
+
+      const newImg = document.createElement('img');
+      const testPath = `${TEST_HOST}/img/testimg.png`;
+      newImg.className = 'lazy';
+      newImg.setAttribute('data-src', testPath);
+      document.body.appendChild(newImg);
+      newImg.scrollIntoView();
+
+      setTimeout(() => {
+        expect(LazyLoader.loadImage).toHaveBeenCalled();
+        expect(newImg).toHaveClass('js-lazy-loaded');
+        done();
+      }, 50);
     });
-    // Doing everything that happens normally in onload
-    lazyLoader.loadCheck();
   });
-  describe('behavior', function() {
+
+  describe('with IntersectionObserver enabled', () => {
+    beforeEach(function() {
+      loadFixtures('issues/issue_with_comment.html.raw');
+
+      lazyLoader = new LazyLoader({
+        observerNode: 'foobar',
+      });
+
+      spyOn(LazyLoader, 'loadImage').and.callThrough();
+
+      spyOn(window, 'requestAnimationFrame').and.callFake(execImmediately);
+      spyOn(window, 'requestIdleCallback').and.callFake(execImmediately);
+
+      // Doing everything that happens normally in onload
+      lazyLoader.register();
+    });
+
+    afterEach(() => {
+      lazyLoader.unregister();
+    });
+
     it('should copy value from data-src to src for img 1', function(done) {
       const img = document.querySelectorAll('img[data-src]')[0];
       const originalDataSrc = img.getAttribute('data-src');
       img.scrollIntoView();
 
       setTimeout(() => {
+        expect(LazyLoader.loadImage).toHaveBeenCalled();
         expect(img.getAttribute('src')).toBe(originalDataSrc);
-        expect(document.getElementsByClassName('js-lazy-loaded').length).toBeGreaterThan(0);
+        expect(img).toHaveClass('js-lazy-loaded');
         done();
-      }, 100);
+      }, 50);
     });
 
     it('should lazy load dynamically added data-src images', function(done) {
       const newImg = document.createElement('img');
-      const testPath = '/img/testimg.png';
+      const testPath = `${TEST_HOST}/img/testimg.png`;
       newImg.className = 'lazy';
       newImg.setAttribute('data-src', testPath);
       document.body.appendChild(newImg);
       newImg.scrollIntoView();
 
       setTimeout(() => {
+        expect(LazyLoader.loadImage).toHaveBeenCalled();
         expect(newImg.getAttribute('src')).toBe(testPath);
-        expect(document.getElementsByClassName('js-lazy-loaded').length).toBeGreaterThan(0);
+        expect(newImg).toHaveClass('js-lazy-loaded');
         done();
-      }, 100);
+      }, 50);
     });
 
     it('should not alter normal images', function(done) {
       const newImg = document.createElement('img');
-      const testPath = '/img/testimg.png';
+      const testPath = `${TEST_HOST}/img/testimg.png`;
       newImg.setAttribute('src', testPath);
       document.body.appendChild(newImg);
       newImg.scrollIntoView();
 
       setTimeout(() => {
+        expect(LazyLoader.loadImage).not.toHaveBeenCalled();
+        expect(newImg).not.toHaveClass('js-lazy-loaded');
+        done();
+      }, 50);
+    });
+
+    it('should not load dynamically added pictures if content observer is turned off', done => {
+      lazyLoader.stopContentObserver();
+
+      const newImg = document.createElement('img');
+      const testPath = `${TEST_HOST}/img/testimg.png`;
+      newImg.className = 'lazy';
+      newImg.setAttribute('data-src', testPath);
+      document.body.appendChild(newImg);
+      newImg.scrollIntoView();
+
+      setTimeout(() => {
+        expect(LazyLoader.loadImage).not.toHaveBeenCalled();
         expect(newImg).not.toHaveClass('js-lazy-loaded');
         done();
-      }, 100);
+      }, 50);
+    });
+
+    it('should load dynamically added pictures if content observer is turned off and on again', done => {
+      lazyLoader.stopContentObserver();
+      lazyLoader.startContentObserver();
+
+      const newImg = document.createElement('img');
+      const testPath = `${TEST_HOST}/img/testimg.png`;
+      newImg.className = 'lazy';
+      newImg.setAttribute('data-src', testPath);
+      document.body.appendChild(newImg);
+      newImg.scrollIntoView();
+
+      setTimeout(() => {
+        expect(LazyLoader.loadImage).toHaveBeenCalled();
+        expect(newImg).toHaveClass('js-lazy-loaded');
+        done();
+      }, 50);
     });
   });
 });

spec/requests/api/issues_spec.rb

@@ -172,6 +172,15 @@ describe API::Issues do
         expect(first_issue['id']).to eq(issue2.id)
       end
 
+      it 'returns issues with no assignee' do
+        issue2 = create(:issue, author: user2, project: project)
+
+        get api('/issues', user), assignee_id: 0, scope: 'all'
+
+        expect_paginated_array_response(size: 1)
+        expect(first_issue['id']).to eq(issue2.id)
+      end
+
       it 'returns issues reacted by the authenticated user by the given emoji' do
         issue2 = create(:issue, project: project, author: user, assignees: [user])
         award_emoji = create(:award_emoji, awardable: issue2, user: user2, name: 'star')