Fixed a problem with how focus was being set.

web/src/App.js

@@ -200,16 +200,20 @@ export class App extends React.Component
     componentDidUpdate() {
         // we've finished rendering the page, check if we should set focus
         if ( this._setFocusTo ) {
+            // yup - set focus to the requested control
             if ( this._setFocusTo.current )
                 this._setFocusTo.current.focus() ;
             else
                 this._setFocusTo.focus() ;
         }
         else {
+            // nope - set focus to the search results (so that Page Up/Down et.al. will work)
+            if ( ! this._modalFormRef.current ) {
                 let elem = document.getElementById( "search-results" ) ;
                 if ( elem )
                     setTimeout( () => elem.focus(), 10 ) ;
             }
+        }
         this._setFocusTo = null ;
     }