fix: Fix SNV Editor Back Url - MEED-6937 - Meeds-io/meeds#2060 (#82)

Prior to this change, when editing SNV in full edit mode (with a new
page opened in a new tab) and then the user publishes the SNV content,
the SNV redirects to the previous page which is the Layout Editor. When
the layout editor is opened again in a new Tab, a new draft page is
opened and makes the first Tab with Layout editor in an invalid state.
This change will avoid redirection to layout editor when publishing the
SNV by introducing a global variable indicating the page being edited in
editor and that should be used for redirection in SNV.

layout-webapp/src/main/webapp/vue-app/layout-editor/main.js

@@ -85,6 +85,7 @@ export function init() {
           diffScrollX: 0,
           diffScrollY: 0,
           gap: 20,
+          nodeUri: null,
         }),
         computed: {
           parentAppX() {
@@ -126,6 +127,11 @@ export function init() {
               this.$root.$emit('layout-editor-moving-end', this.movingParentId);
             }
           },
+          nodeUri() {
+            if (this.nodeUri) {
+              eXo.env.portal.webPageUrl = `/portal${this.nodeUri}`;
+            }
+          },
           layout(newVal, oldVal) {
             if (!oldVal) {
               window.setTimeout(() => document.dispatchEvent(new CustomEvent('hideTopBarLoading')), 200);