Improve issue/mr page for tablets

Signed-off-by: Dmitriy Zaporozhets <dmitriy.zaporozhets@gmail.com>

app/assets/stylesheets/sections/merge_requests.scss

@@ -19,7 +19,8 @@
   }
 }
 
-.merge-request .merge-request-tabs{
+@media(min-width: $screen-sm-max) {
+  .merge-request .merge-request-tabs{
     margin: 20px 0;
 
     li {
@@ -28,6 +29,7 @@
         font-size: 14px;
       }
     }
+  }
 }
 
 .mr_source_commit,

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

@@ -5,7 +5,7 @@
     - else
       = link_to 'Close Issue', project_issue_path(@project, @issue, issue: {state_event: :close }, status_only: true), method: :put, class: "btn btn-grouped btn-close js-note-target-close", title: "Close Issue"
 .row
-  .col-sm-9
+  .col-md-9
     .participants
       %cite.cgray
         = pluralize(@issue.participants.count, 'participant')
@@ -13,7 +13,7 @@
         = link_to_member(@project, participant, name: false, size: 24)
 
     .voting_notes#notes= render "projects/notes/notes_with_form"
-  .col-sm-3
+  .col-md-3.hidden-sm.hidden-xs
     %div
     .clearfix
       %span.slead.has_tooltip{:"data-original-title" => 'Cross-project reference'}

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

@@ -6,10 +6,10 @@
       = link_to 'Reopen', project_merge_request_path(@project, @merge_request, merge_request: {state_event: :reopen }), method: :put, class: "btn btn-grouped btn-reopen reopen-mr-link js-note-target-reopen", title: "Reopen merge request"
 
 .row
-  .col-sm-9
+  .col-md-9
     = render "projects/merge_requests/show/participants"
     = render "projects/notes/notes_with_form"
-  .col-sm-3
+  .col-md-3.hidden-sm.hidden-xs
     .clearfix
       %span.slead.has_tooltip{:"data-original-title" => 'Cross-project reference'}
         = cross_project_reference(@project, @merge_request)