Disable the escape key in the "confirm discard" dialog

src/Umbraco.Web.UI.Client/src/common/directives/components/overlays/umboverlay.directive.js

@@ -286,11 +286,11 @@ Opens an overlay to show a custom YSOD. </br>
 
             $(document).on("keydown.overlay-" + overlayNumber, function(event) {
 
-               if (event.which === 27) {
+                if (event.which === 27) {
 
                   numberOfOverlays = overlayHelper.getNumberOfOverlays();
 
-                  if (numberOfOverlays === overlayNumber) {
+                  if (numberOfOverlays === overlayNumber && !scope.model.disableEscKey) {
                       scope.$apply(function () {
                           scope.closeOverLay();
                       });

src/Umbraco.Web.UI.Client/src/common/directives/validation/valformmanager.directive.js

@@ -165,6 +165,7 @@ function valFormManager(serverValidationManager, $rootScope, $timeout, $location
                             "title": labels.unsavedChangesTitle,
                             "content": labels.unsavedChangesContent,
                             "disableBackdropClick": true,
+                            "disableEscKey": true,
                             "submitButtonLabel": labels.stayButton,
                             "closeButtonLabel": labels.discardChangesButton,
                             submit: function() {