Follow changes in the theme name immediately in static theme wizard

static/js/zamboni/static_theme.js

@@ -48,6 +48,10 @@ $(document).ready(function() {
 
         function updateManifest() {
             textarea = $wizard.find('#manifest').val(generateManifest());
+            toggleSubmitIfNeeded();
+        }
+
+        function toggleSubmitIfNeeded() {
             $wizard.find('button.upload').attr('disabled', ! required_fields_present());
         }
 
@@ -120,9 +124,16 @@ $(document).ready(function() {
                 updateManifest();
             }
         });
-        /* force the pop-up panel ltr or the images end up in the wrong position. */
+        /* Force the pop-up panel ltr or the images end up in the wrong
+           position. */
         $wizard.find('div.minicolors-panel').attr('dir', 'ltr');
 
+        /* The submit button availability needs to follow changes to the theme
+           name as soon as they happen, to react properly if it's modified but
+           the user hasn't focused something else yet */
+        $wizard.on('input', '#theme-name', toggleSubmitIfNeeded);
+        /* We update the full manifest when a proper change event is triggered,
+           the user has finished editing the name at this point. */
         $wizard.on('change', '#theme-name', updateManifest);
 
         $wizard.on('click', 'button.upload', _pd(function(event) {