Bug 1580188 - Not all search matches are highlighted. r=Honza

Differential Revision: https://phabricator.services.mozilla.com/D45483

--HG--
extra : moz-landing-system : lando

devtools/client/netmonitor/src/components/search/SearchPanel.js

@@ -168,7 +168,7 @@ class SearchPanel extends Component {
       const indexEnd = indexStart + query.length;
 
       // Handles a match in a string
-      if (indexStart > 0) {
+      if (indexStart >= 0) {
         return span(
           { title: object.value },
           span({}, object.value.substring(0, indexStart)),