Added a keyboard shortcut to set focus to the query string.

web/src/App.js

@@ -378,7 +378,7 @@ export class App extends React.Component
 
     onKeyDown( evt ) {
         // check if a modal dialog is open and Ctrl-Enter was pressed
-        if ( this._modalFormRef && evt.keyCode === 13 && evt.ctrlKey ) {
+        if ( this._modalFormRef.current && evt.keyCode === 13 && evt.ctrlKey ) {
             let dlg = ReactDOM.findDOMNode( this._modalFormRef.current ) ;
             if ( dlg ) {
                 // yup - accept the dialog
@@ -389,6 +389,19 @@ export class App extends React.Component
                     console.log( "ERROR: Can't find default button." ) ;
             }
         }
+        // check for other shortcuts
+        if ( ! this._modalFormRef.current ) {
+            // Alt-R: set focus to query string
+            if ( evt.key === "r" && evt.altKey ) {
+                if ( this._searchFormRef.current ) {
+                    let elem = this._searchFormRef.current.queryStringRef.current ;
+                    if ( elem ) {
+                        elem.focus() ;
+                        elem.select() ;
+                    }
+                }
+            }
+        }
     }
 
     logInternalError( msg, detail ) {

web/src/SearchForm.js

@@ -20,7 +20,7 @@ export default class SearchForm extends React.Component
     render() {
         return (
             <form id="search-form" onSubmit={this.onSearch.bind(this)}>
-            <label className="caption"> Search&nbsp;for: </label>
+            <label className="caption"> Sea<u>r</u>ch&nbsp;for: </label>
             <input type="text" className="query"
                 value = {this.state.queryString}
                 onChange = { e => this.setState( { queryString: e.target.value } ) }