Merge branch 'stable-2.15' into stable-2.16

* stable-2.15:
  Fix single tab indentation in diff

Change-Id: I2b4844cfc6bb065f3ac69d11c065095b47f226b7

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

@@ -179,6 +179,7 @@ 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. */