Add a bit of debugging for clear cache & reload button

src/components/views/settings/tabs/user/HelpUserSettingsTab.js

@@ -71,6 +71,9 @@ export default class HelpUserSettingsTab extends React.Component {
     _onClearCacheAndReload = (e) => {
         if (!PlatformPeg.get()) return;
 
+        // Dev note: please keep this log line, it's useful when troubleshooting a MatrixClient suddenly
+        // stopping in the middle of the logs.
+        console.log("Clear cache & reload clicked");
         MatrixClientPeg.get().stopClient();
         MatrixClientPeg.get().store.deleteAllData().done(() => {
             PlatformPeg.get().reload();