adjusted project thumbnail in "save" dialog

HISTORY.md

@@ -12,6 +12,7 @@
 * gui, scenes, store: proxied thumbnail, name and notes in project, restored in XML
 * gui: distinguished project name from scene names, removed hidden "export as plain text" option
 * gui: sceneified project notes
+* gui: adjusted project thumbnail in "save" dialog
 
 ### 2021-05-20
 * gui: marked projectName to be refactored and sceneified

src/gui.js

@@ -7117,7 +7117,7 @@ ProjectDialogMorph.prototype.buildContents = function () {
 
     this.body.add(this.preview);
     if (this.task === 'save') {
-        thumbnail = this.ide.stage.thumbnail( // +++ get the project thumbnail
+        thumbnail = this.ide.scenes.at(1).stage.thumbnail(
             SnapSerializer.prototype.thumbnailSize
         );
         this.preview.texture = null;