Fixes issue with issue sidebar toggle button not working

Closes #14195

app/assets/javascripts/application.js.coffee

@@ -220,17 +220,17 @@ $ ->
     .off 'breakpoint:change'
     .on 'breakpoint:change', (e, breakpoint) ->
       if breakpoint is 'sm' or breakpoint is 'xs'
-        $gutterIcon = $('aside .gutter-toggle').find('i')
+        $gutterIcon = $('.js-sidebar-toggle').find('i')
         if $gutterIcon.hasClass('fa-angle-double-right')
           $gutterIcon.closest('a').trigger('click')
 
   $(document)
-    .off 'click', 'aside .gutter-toggle'
-    .on 'click', 'aside .gutter-toggle', (e, triggered) ->
+    .off 'click', '.js-sidebar-toggle'
+    .on 'click', '.js-sidebar-toggle', (e, triggered) ->
       e.preventDefault()
       $this = $(this)
       $thisIcon = $this.find 'i'
-      $allGutterToggleIcons = $('.gutter-toggle i')
+      $allGutterToggleIcons = $('.js-sidebar-toggle i')
       if $thisIcon.hasClass('fa-angle-double-right')
         $allGutterToggleIcons
           .removeClass('fa-angle-double-right')

app/assets/javascripts/merge_request_tabs.js.coffee

@@ -189,7 +189,7 @@ class @MergeRequestTabs
     $('.container-fluid').removeClass('container-limited')
 
   shrinkView: ->
-    $gutterIcon = $('.gutter-toggle i')
+    $gutterIcon = $('.js-sidebar-toggle i')
 
     # Wait until listeners are set
     setTimeout( ->
@@ -197,4 +197,3 @@ class @MergeRequestTabs
       if $gutterIcon.is('.fa-angle-double-right')
         $gutterIcon.closest('a').trigger('click',[true])
     , 0)
-

app/views/projects/issues/show.html.haml

@@ -18,7 +18,7 @@
         %span.hidden-sm.hidden-md.hidden-lg
           = icon('circle-o')
 
-    %a.btn.btn-default.pull-right.hidden-sm.hidden-md.hidden-lg.gutter-toggle{ href: "#" }
+    %a.btn.btn-default.pull-right.visible-xs.gutter-toggle.js-sidebar-toggle{ href: "#" }
       = icon('angle-double-left')
 
     .issue-meta

app/views/projects/merge_requests/show/_mr_title.html.haml

@@ -4,7 +4,7 @@
       = @merge_request.state_human_name
     %span.hidden-sm.hidden-md.hidden-lg
       = icon(@merge_request.state_icon_name)
-  %a.btn.btn-default.pull-right.hidden-sm.hidden-md.hidden-lg.gutter-toggle{ href: "#" }
+  %a.btn.btn-default.pull-right.visible-xs.gutter-toggle.js-sidebar-toggle{ href: "#" }
     = icon('angle-double-left')
   .issue-meta
     %strong.identifier

app/views/shared/issuable/_sidebar.html.haml

@@ -6,7 +6,7 @@
         of
         = issuables_count(issuable)
       %span.pull-right
-        %a.gutter-toggle{href: '#'}
+        %a.gutter-toggle.js-sidebar-toggle{href: '#'}
           = sidebar_gutter_toggle_icon
       .issuable-nav.hide-collapsed.pull-right.btn-group{role: 'group', "aria-label" => '...'}
         - if prev_issuable = prev_issuable_for(issuable)