Fix the "Reload with full diff" URL button

On the first load, the merge request tabs would be requested in JSON format to render
the HTML. This would cause the "Reload with full diff" button to create a link to diff.json.

Closes #2041

5 files changed, 12 insertions, 13 deletions

diff --git a/CHANGELOG b/CHANGELOG
index c6c5bc0aac4..9610a350442 100644
--- a/CHANGELOG
+++ b/CHANGELOG
@@ -3,6 +3,7 @@ Please view this file on the master branch, on stable branches it's out of date.
 v 7.14.0 (unreleased)
   - Fix full screen mode for snippet comments (Daniel Gerhardt)
   - Fix 404 error in files view after deleting the last file in a repository (Stan Hu)
+  - Fix the "Reload with full diff" URL button (Stan Hu)
   - Fix label read access for unauthenticated users (Daniel Gerhardt)
   - Fix access to disabled features for unauthenticated users (Daniel Gerhardt)
   - Fix OAuth provider bug where GitLab would not go return to the redirect_uri after sign-in (Stan Hu)
diff --git a/app/assets/javascripts/merge_request_tabs.js.coffee b/app/assets/javascripts/merge_request_tabs.js.coffee
index a132a0a9dcc..19a07b6a033 100644
--- a/app/assets/javascripts/merge_request_tabs.js.coffee
+++ b/app/assets/javascripts/merge_request_tabs.js.coffee
@@ -49,12 +49,6 @@ class @MergeRequestTabs
     # Store the `location` object, allowing for easier stubbing in tests
     @_location = location
 
-    switch @opts.action
-      when 'commits'
-        @commitsLoaded = true
-      when 'diffs'
-        @diffsLoaded = true
-
     @bindEvents()
     @activateTab(@opts.action)
 
@@ -102,7 +96,7 @@ class @MergeRequestTabs
     action = 'notes' if action == 'show'
 
     # Remove a trailing '/commits' or '/diffs'
-    new_state = @_location.pathname.replace(/\/(commits|diffs)\/?$/, '')
+    new_state = @_location.pathname.replace(/\/(commits|diffs)(\.html)?\/?$/, '')
 
     # Append the new action if we're on a tab other than 'notes'
     unless action == 'notes'
@@ -133,7 +127,7 @@ class @MergeRequestTabs
     return if @diffsLoaded
 
     @_get
-      url: "#{source}.json"
+      url: "#{source}.json" + @_location.search
       success: (data) =>
         document.getElementById('diffs').innerHTML = data.html
         @diffsLoaded = true
diff --git a/app/views/projects/diffs/_warning.html.haml b/app/views/projects/diffs/_warning.html.haml
index da3d4be84ba..caed0e69dc8 100644
--- a/app/views/projects/diffs/_warning.html.haml
+++ b/app/views/projects/diffs/_warning.html.haml
@@ -3,7 +3,7 @@
     Too many changes to show.
     .pull-right
       - unless diff_hard_limit_enabled?
-        = link_to "Reload with full diff", url_for(params.merge(force_show_diff: true)), class: "btn btn-sm btn-warning"
+        = link_to "Reload with full diff", url_for(params.merge(force_show_diff: true, format: :html)), class: "btn btn-sm btn-warning"
 
       - if current_controller?(:commit) or current_controller?(:merge_requests)
         - if current_controller?(:commit)
diff --git a/app/views/projects/merge_requests/_show.html.haml b/app/views/projects/merge_requests/_show.html.haml
index faaa85896cf..c57eee14143 100644
--- a/app/views/projects/merge_requests/_show.html.haml
+++ b/app/views/projects/merge_requests/_show.html.haml
@@ -66,11 +66,9 @@
     #notes.notes.tab-pane.voting_notes
       = render "projects/merge_requests/discussion"
     #commits.commits.tab-pane
-      - if current_page?(action: 'commits')
-        = render "projects/merge_requests/show/commits"
+      - # This tab is always loaded via AJAX
     #diffs.diffs.tab-pane
-      - if current_page?(action: 'diffs')
-        = render "projects/merge_requests/show/diffs"
+      - # This tab is always loaded via AJAX
 
   .mr-loading-status
     = spinner
diff --git a/spec/javascripts/merge_request_tabs_spec.js.coffee b/spec/javascripts/merge_request_tabs_spec.js.coffee
index 6cc96fb68a0..a0cfba455ea 100644
--- a/spec/javascripts/merge_request_tabs_spec.js.coffee
+++ b/spec/javascripts/merge_request_tabs_spec.js.coffee
@@ -51,6 +51,12 @@ describe 'MergeRequestTabs', ->
       expect(@subject('notes')).toBe('/foo/bar/merge_requests/1')
       expect(@subject('commits')).toBe('/foo/bar/merge_requests/1/commits')
 
+    it 'changes from diffs.html', ->
+      @class._location = stubLocation(pathname: '/foo/bar/merge_requests/1/diffs.html')
+
+      expect(@subject('notes')).toBe('/foo/bar/merge_requests/1')
+      expect(@subject('commits')).toBe('/foo/bar/merge_requests/1/commits')
+
     it 'changes from notes', ->
       @class._location = stubLocation(pathname: '/foo/bar/merge_requests/1')