Fix bug where reopening edit modal of shared env instance wouldnt render text editor

static/js/mithril/sharedEnvironments.js

@@ -125,6 +125,11 @@ const SharedEnvironments = {
 
     closeModal: function() {
         SharedEnvironments.modal.isOpen = false;
+        // Destroy editor reference so it can be recreated next time
+        if (SharedEnvironments.envEditor) {
+            SharedEnvironments.envEditor.destroy();
+            SharedEnvironments.envEditor = null;
+        }
     },
 
     saveEnvironment: async function(e) {