adding umbNestedProperty to build up a json path for a targeted nested property type.

src/Umbraco.Web.UI.Client/src/views/propertyeditors/nestedcontent/nestedcontent.controller.js

@@ -586,8 +586,14 @@
                 for (var p = 0; p < tab.properties.length; p++) {
                     var prop = tab.properties[p];
 
+                    // store the original alias before we change below, see notes
                     prop.propertyAlias = prop.alias;
+
+                    // NOTE: This is super ugly, the reason it is like this is because it controls the label/html id in the umb-property component at a higher level.
+                    // not pretty :/ but we can't change this now since it would require a bunch of plumbing to be able to change the id's higher up.
                     prop.alias = model.alias + "___" + prop.alias;
+
+                    // TODO: Do we need to deal with this separately?
                     // Force validation to occur server side as this is the
                     // only way we can have consistency between mandatory and
                     // regex validation messages. Not ideal, but it works.