Set default spanIndex based on spanId specified in URL hash, this sho…

…uld scroll to the span, open up the span and highlight it

zipkin-lens/src/components/TracePage/TraceSummary.jsx

@@ -34,7 +34,13 @@ const TraceSummary = React.memo(({ traceSummary }) => {
  const isRootedTrace = hasRootSpan(traceSummary.spans);
  const [rootSpanIndex, setRootSpanIndex] = useState(0);
  const isRerooted = rootSpanIndex !== 0;
- const [currentSpanIndex, setCurrentSpanIndex] = useState(0);
+
+
+ // If spanId is present as hash (subresource) make that the spanIndex to load
+ const getSpanIndexOnLoad = window.location.hash !== "" ?
+ findSpanIndex(traceSummary.spans, window.location.hash.substring(1)) : 0;
+
+ const [currentSpanIndex, setCurrentSpanIndex] = useState(getSpanIndexOnLoad);
  const [childrenHiddenSpanIndices, setChildrenHiddenSpanIndices] = useState(
  {},
  );