Merge pull request #2277 from umbraco/temp-U4-10589

U4-10589 Login should be sanitized and/or cause validation errors if trying to save with

src/Umbraco.Web.UI.Client/src/common/services/umbdataformatter.service.js

@@ -243,7 +243,7 @@
                     return item.alias === "_umb_membergroup";
                 });
                 saveModel.email = propEmail.value;
-                saveModel.username = propLogin.value;
+                saveModel.username = propLogin.value.trim();
                 
                 saveModel.password = this.formatChangePasswordModel(propPass.value);