open dialog: Dont show cloud projects if user has since switch panes

gui.js

@@ -5112,7 +5112,10 @@ ProjectDialogMorph.prototype.setSource = function (source) {
         this.projectList = [];
         SnapCloud.getProjectList(
             function (projectList) {
-                myself.installCloudProjectList(projectList);
+                // Don't show cloud projects if user has since switch panes.
+                if (myself.source === 'cloud') {
+                    myself.installCloudProjectList(projectList);
+                }
                 msg.destroy();
             },
             function (err, lbl) {