Copying and pasting doesn't grab line numbers or +/-

app/assets/stylesheets/pages/diff.scss

@@ -67,6 +67,14 @@
         line-height: $code_line_height;
         font-size: $code_font_size;
+        &.noteable_line.old:before {
+          content: '-';
+        }
+
+        &.noteable_line.new:before {
+          content: '+';
+        }
+
         span {
           white-space: pre;
         }
@@ -391,3 +399,15 @@
     margin-bottom: 0;
   }
 }
+
+.diff-line-num:not(.js-unfold-bottom) {
+  a {
+    &:before {
+      content: attr(data-linenumber);
+    }
+    -moz-user-select: none;
+    -webkit-user-select: none;
+    -ms-user-select: none;
+    user-select: none;
+  }
+}

app/helpers/diff_helper.rb

@@ -44,6 +44,7 @@ module DiffHelper
     if line.blank?
       "  ".html_safe
     else
+      line[0] = ''
       line
     end
   end

app/views/projects/blob/diff.html.haml

@@ -9,9 +9,9 @@
     - line_old = line_new - @form.offset
     %tr.line_holder
       %td.old_line.diff-line-num{data: {linenumber: line_old}}
-        = link_to raw(line_old), "#"
-      %td.new_line.diff-line-num
-        = link_to raw(line_new) , "#"
+        / = link_to raw(line_old), "#"
+      %td.new_line.diff-line-num{data: {linenumber: line_old}}
+        / = link_to raw(line_new) , "#"
       %td.line_content.noteable_line==#{' ' * @form.indent}#{line}
   - if @form.unfold? && @form.bottom? && @form.to < @blob.loc

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

@@ -9,12 +9,12 @@
     %td.new_line.diff-line-num
     %td.line_content.match= line.text
   - else
-    %td.old_line.diff-line-num{class: type}
+    %td.old_line.diff-line-num{class: type, data: {linenumber: line.new_pos}}
       - link_text = raw(type == "new" ? " " : line.old_pos)
       - if defined?(plain) && plain
         = link_text
       - else
-        = link_to link_text, "##{line_code}", id: line_code
+        = link_to "", "##{line_code}", id: line_code, data: { linenumber: link_text }
       - if @comments_allowed && can?(current_user, :create_note, @project)
         = link_to_new_diff_note(line_code)
     %td.new_line.diff-line-num{class: type, data: {linenumber: line.new_pos}}
@@ -22,5 +22,5 @@
       - if defined?(plain) && plain
         = link_text
       - else
-        = link_to link_text, "##{line_code}", id: line_code
+        = link_to "", "##{line_code}", id: line_code, data: { linenumber: link_text }
     %td.line_content{class: "noteable_line #{type} #{line_code}", data: { line_code: line_code }}= diff_line_content(line.text)