Add mobile viewport

app/assets/stylesheets/framework/mobile.scss

@@ -23,12 +23,16 @@
     margin-right: 0;
   }
 
-  .issues-details-filters,
+  .issues-details-filters:not(.filtered-search-block),
   .dash-projects-filters,
   .check-all-holder {
     display: none;
   }
 
+  .issues-holder .issue-check {
+    display: none;
+  }
+
   .rss-btn {
     display: none;
   }

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

@@ -2,7 +2,7 @@
 - boards_page = controller.controller_name == 'boards'
 
 .issues-filters
-  .issues-details-filters.row-content-block.second-block
+  .issues-details-filters.row-content-block.second-block.filtered-search-block
     = form_tag page_filter_path(without: [:assignee_id, :author_id, :milestone_title, :label_name, :search]), method: :get, class: 'filter-form js-filter-form' do
       - if params[:search].present?
         = hidden_field_tag :search, params[:search]