Merge branch 'stable-2.16' into stable-3.0

* stable-2.16:
  Fix single tab indentation in diff

Change-Id: I5cd25d3599e1df4e36fc72ffbbc01ea7d4a7cc62

polygerrit-ui/app/elements/diff/gr-diff/gr-diff.html

@@ -183,6 +183,7 @@ limitations under the License.
         color: var(--diff-tab-indicator-color);
         /* >> character */
         content: '\00BB';
+        position: absolute;
       }
       /* Is defined after other background-colors, such that this
          rule wins in case of same specificity. */