fix for wonky screenshot behavior when editing a composition

Fixes #885

Author: starpit

app/plugins/modules/editor/lib/editor.css

@@ -88,6 +88,10 @@
     flex: 6;
     border-top: 1px solid var(--color-ui-04);
     background: white;
+
+    /* see shell issue #885 */
+    display: flex;
+    flex-direction: column;
 }
 /* wskflow container in editor while sidecar is maximized */
 body.sidecar-full-screen #sidecar .code-highlighting {