Adds tooltips

app/assets/stylesheets/pages/diff.scss

@@ -37,6 +37,10 @@
   .file-title {
     cursor: pointer;
 
+    a:hover {
+      text-decoration: none;
+    }
+
     &:hover {
       background-color: $gray-normal;
     }

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

@@ -10,13 +10,13 @@
 
     - if diff_file.renamed_file
       - old_path, new_path = mark_inline_diffs(diff_file.old_path, diff_file.new_path)
-      %strong.file-title-name
+      %strong.file-title-name.has-tooltip{data: { title: old_path } }
         = old_path
       →
-      %strong.file-title-name
+      %strong.file-title-name.has-tooltip{data: { title: new_path } }
         = new_path
     - else
-      %strong.file-title-name
+      %strong.file-title-name.has-tooltip{data: { title: diff_file.new_path } }
         = diff_file.new_path
       - if diff_file.deleted_file
         deleted