Merge branch '22343-honor-user-fixed-layout-pref' into 'master'

Ensure the 'fixed layout' preference is honored whenever possible

## What does this MR do?

Currently, when viewing any Merge Request the user's fixed-layout preference is overridden if they have set "Side-by-Side" view as their preference when viewing diffs.  This makes sense if they are currently viewing a diff, but this is confusing when their layout preference is overridden while they are on another tab (i.e. "Discussion" or "Builds").

This MR moves all responsibility for overriding the fixed layout from the Ruby page layout helper into frontend JavaScript where it is only applied when needed.

## Are there points in the code the reviewer needs to double check?

Check that nothing broke for users which have their layout preference set to "Fluid" as well as those which have it set to "Fixed".  I've already done this but double checking is always good idea .

## Screenshots (if relevant)

![side-by-side-toggle-fixed](/uploads/033dc73e70b73da5692b75606733c938/side-by-side-toggle-fixed.gif)

## Does this MR meet the acceptance criteria?

- [x] [CHANGELOG](https://gitlab.com/gitlab-org/gitlab-ce/blob/master/CHANGELOG) entry added
- Tests
  - [ ] All builds are passing
- [x] Conform by the [style guides](https://gitlab.com/gitlab-org/gitlab-ce/blob/master/CONTRIBUTING.md#style-guides)
- [x] Branch has no merge conflicts with `master` (if you do - rebase it please)
- [x] [Squashed related commits together](https://git-scm.com/book/en/Git-Tools-Rewriting-History#Squashing-Commits)

## What are the relevant issue numbers?

Closes #22343 

## Other Notes

As @lbennett noted in #22343, this is something of a band-aid.  It fixed most of the issue, but we still need to have a discussion about whether or not is acceptable to override user layout preferences for "Side-by-Side" views in general.  At least this MR limits the scope of this behavior to a single tab within an MR or merge conflict page.

See merge request !6422

CHANGELOG

@@ -109,6 +109,7 @@ v 8.12.0
   - Fix long comments in diffs messing with table width
   - Add spec covering 'Gitlab::Git::committer_hash' !6433 (dandunckelman)
   - Fix pagination on user snippets page
+  - Honor "fixed layout" preference in more places !6422
   - Run CI builds with the permissions of users !5735
   - Fix sorting of issues in API
   - Fix download artifacts button links !6407

app/assets/javascripts/diff.js

@@ -7,6 +7,9 @@
     function Diff() {
       $('.files .diff-file').singleFileDiff();
       this.filesCommentButton = $('.files .diff-file').filesCommentButton();
+      if (this.diffViewType() === 'parallel') {
+        $('.content-wrapper .container-fluid').removeClass('container-limited');
+      }
       $(document).off('click', '.js-unfold');
       $(document).on('click', '.js-unfold', (function(_this) {
         return function(event) {
@@ -52,6 +55,10 @@
       })(this));
     }
+    Diff.prototype.diffViewType = function() {
+      return $('.inline-parallel-buttons a.active').data('view-type');
+    }
+
     Diff.prototype.lineNumbers = function(line) {
       if (!line.children().length) {
         return [0, 0];

app/assets/javascripts/merge_conflict_data_provider.js.es6

@@ -7,13 +7,16 @@ const ORIGIN_BUTTON_TITLE = 'Use theirs';
 class MergeConflictDataProvider {
   getInitialData() {
+    // TODO: remove reliance on jQuery and DOM state introspection
     const diffViewType = $.cookie('diff_view');
+    const fixedLayout = $('.content-wrapper .container-fluid').hasClass('container-limited');
     return {
       isLoading      : true,
       hasError       : false,
       isParallel     : diffViewType === 'parallel',
       diffViewType   : diffViewType,
+      fixedLayout    : fixedLayout,
       isSubmitting   : false,
       conflictsData  : {},
       resolutionData : {}
@@ -192,14 +195,17 @@ class MergeConflictDataProvider {
   updateViewType(newType) {
     const vi = this.vueInstance;
-    if (newType === vi.diffView || !(newType === 'parallel' || newType === 'inline')) {
+    if (newType === vi.diffViewType || !(newType === 'parallel' || newType === 'inline')) {
       return;
     }
-    vi.diffView   = newType;
-    vi.isParallel = newType === 'parallel';
-    $.cookie('diff_view', newType); // TODO: Make sure that cookie path added.
-    $('.content-wrapper .container-fluid').toggleClass('container-limited');
+    vi.diffViewType = newType;
+    vi.isParallel   = newType === 'parallel';
+    $.cookie('diff_view', newType, {
+      path: (gon && gon.relative_url_root) || '/'
+    });
+    $('.content-wrapper .container-fluid')
+      .toggleClass('container-limited', !vi.isParallel && vi.fixedLayout);
   }

app/assets/javascripts/merge_conflict_resolver.js.es6

@@ -60,9 +60,8 @@ class MergeConflictResolver {
           $('#conflicts .js-syntax-highlight').syntaxHighlight();
         });
-        if (this.vue.diffViewType === 'parallel') {
-          $('.content-wrapper .container-fluid').removeClass('container-limited');
-        }
+        $('.content-wrapper .container-fluid')
+          .toggleClass('container-limited', !this.vue.isParallel && this.vue.fixedLayout);
       })
   }

app/assets/javascripts/merge_request.js

@@ -36,13 +36,10 @@
     };
     MergeRequest.prototype.initTabs = function() {
-      if (this.opts.action !== 'new') {
-        // `MergeRequests#new` has no tab-persisting or lazy-loading behavior
-        window.mrTabs = new MergeRequestTabs(this.opts);
-      } else {
-        // Show the first tab (Commits)
-        return $('.merge-request-tabs a[data-toggle="tab"]:first').tab('show');
+      if (window.mrTabs) {
+        window.mrTabs.unbindEvents();
       }
+      window.mrTabs = new MergeRequestTabs(this.opts);
     };
     MergeRequest.prototype.showAllCommits = function() {

app/assets/javascripts/merge_request_tabs.js

@@ -56,6 +56,8 @@
     MergeRequestTabs.prototype.commitsLoaded = false;
+    MergeRequestTabs.prototype.fixedLayoutPref = null;
+
     function MergeRequestTabs(opts) {
       this.opts = opts != null ? opts : {};
       this.opts.setUrl = this.opts.setUrl !== undefined ? this.opts.setUrl : true;
@@ -70,7 +72,12 @@
     MergeRequestTabs.prototype.bindEvents = function() {
       $(document).on('shown.bs.tab', '.merge-request-tabs a[data-toggle="tab"]', this.tabShown);
-      return $(document).on('click', '.js-show-tab', this.showTab);
+      $(document).on('click', '.js-show-tab', this.showTab);
+    };
+
+    MergeRequestTabs.prototype.unbindEvents = function() {
+      $(document).off('shown.bs.tab', '.merge-request-tabs a[data-toggle="tab"]', this.tabShown);
+      $(document).off('click', '.js-show-tab', this.showTab);
     };
     MergeRequestTabs.prototype.showTab = function(event) {
@@ -85,11 +92,15 @@
       if (action === 'commits') {
         this.loadCommits($target.attr('href'));
         this.expandView();
+        this.resetViewContainer();
       } else if (action === 'diffs') {
         this.loadDiff($target.attr('href'));
         if ((typeof bp !== "undefined" && bp !== null) && bp.getBreakpointSize() !== 'lg') {
           this.shrinkView();
         }
+        if (this.diffViewType() === 'parallel') {
+          this.expandViewContainer();
+        }
         navBarHeight = $('.navbar-gitlab').outerHeight();
         $.scrollTo(".merge-request-details .merge-request-tabs", {
           offset: -navBarHeight
@@ -97,11 +108,14 @@
       } else if (action === 'builds') {
         this.loadBuilds($target.attr('href'));
         this.expandView();
+        this.resetViewContainer();
       } else if (action === 'pipelines') {
         this.loadPipelines($target.attr('href'));
         this.expandView();
+        this.resetViewContainer();
       } else {
         this.expandView();
+        this.resetViewContainer();
       }
       if (this.opts.setUrl) {
         this.setCurrentAction(action);
@@ -126,7 +140,7 @@
       if (action === 'show') {
         action = 'notes';
       }
-      return $(".merge-request-tabs a[data-action='" + action + "']").tab('show');
+      $(".merge-request-tabs a[data-action='" + action + "']").tab('show').trigger('shown.bs.tab');
     };
     // Replaces the current Merge Request-specific action in the URL with a new one
@@ -209,7 +223,7 @@
             gl.utils.localTimeAgo($('.js-timeago', 'div#diffs'));
             $('#diffs .js-syntax-highlight').syntaxHighlight();
             $('#diffs .diff-file').singleFileDiff();
-            if (_this.diffViewType() === 'parallel') {
+            if (_this.diffViewType() === 'parallel' && _this.currentAction === 'diffs') {
               _this.expandViewContainer();
             }
             _this.diffsLoaded = true;
@@ -308,11 +322,21 @@
     MergeRequestTabs.prototype.diffViewType = function() {
       return $('.inline-parallel-buttons a.active').data('view-type');
-    // Returns diff view type
     };
     MergeRequestTabs.prototype.expandViewContainer = function() {
-      return $('.container-fluid').removeClass('container-limited');
+      var $wrapper = $('.content-wrapper .container-fluid');
+      if (this.fixedLayoutPref === null) {
+        this.fixedLayoutPref = $wrapper.hasClass('container-limited');
+      }
+      $wrapper.removeClass('container-limited');
+    };
+
+    MergeRequestTabs.prototype.resetViewContainer = function() {
+      if (this.fixedLayoutPref !== null) {
+        $('.content-wrapper .container-fluid')
+          .toggleClass('container-limited', this.fixedLayoutPref);
+      }
     };
     MergeRequestTabs.prototype.shrinkView = function() {

app/helpers/page_layout_helper.rb

@@ -92,12 +92,8 @@ module PageLayoutHelper
     end
   end
-  def fluid_layout(enabled = false)
-    if @fluid_layout.nil?
-      @fluid_layout = (current_user && current_user.layout == "fluid") || enabled
-    else
-      @fluid_layout
-    end
+  def fluid_layout
+    current_user && current_user.layout == "fluid"
   end
   def blank_container(enabled = false)

app/views/layouts/header/_default.html.haml

 %header.navbar.navbar-fixed-top.navbar-gitlab{ class: nav_header_class }
-  %div{ class: fluid_layout ? "container-fluid" : "container-fluid" }
+  %div{ class: "container-fluid" }
     .header-content
       %button.side-nav-toggle{ type: 'button', "aria-label" => "Toggle global navigation" }
         %span.sr-only Toggle navigation

app/views/profiles/preferences/update.js.erb

@@ -4,9 +4,9 @@ $('body').addClass('<%= user_application_theme %>')
 // Toggle container-fluid class
 if ('<%= current_user.layout %>' === 'fluid') {
-  $('.content-wrapper').find('.container-fluid').removeClass('container-limited')
+  $('.content-wrapper .container-fluid').removeClass('container-limited')
 } else {
-  $('.content-wrapper').find('.container-fluid').addClass('container-limited')
+  $('.content-wrapper .container-fluid').addClass('container-limited')
 }
 // Re-enable the "Save" button

app/views/projects/diffs/_diffs.html.haml

 - show_whitespace_toggle = local_assigns.fetch(:show_whitespace_toggle, true)
 - diff_files = diffs.diff_files
-- if diff_view == :parallel
-  - fluid_layout true
 .content-block.oneline-block.files-changed
   .inline-parallel-buttons

app/views/projects/merge_requests/_show.html.haml

@@ -4,9 +4,6 @@
 - content_for :page_specific_javascripts do
   = page_specific_javascript_tag('diff_notes/diff_notes_bundle.js')
-- if diff_view == :parallel
-  - fluid_layout true
-
 .merge-request{'data-url' => merge_request_path(@merge_request)}
   = render "projects/merge_requests/show/mr_title"