NEW Open first tab with validation errors

admin/javascript/LeftAndMain.EditForm.js

@@ -88,6 +88,11 @@
 				if(this.hasClass('validationerror')) {
 					// TODO validation shouldnt need a special case
 					statusMessage(ss.i18n._t('ModelAdmin.VALIDATIONERROR', 'Validation Error'), 'bad');
+
+					// Ensure the first validation error is visible
+					var firstTabWithErrors = this.find('.message.validation:first').closest('.tab');
+					$('.cms-container').clearCurrentTabState(); // clear state to avoid override later on
+					firstTabWithErrors.closest('.tabset').tabs('select', firstTabWithErrors.attr('id'));
 				}
 
 				// Move navigator to preview if one is available.

admin/javascript/LeftAndMain.js

@@ -473,6 +473,30 @@ jQuery.noConflict();
 				}
 			},
 
+			/**
+			 * Remove any previously saved state.
+			 *
+			 * Parameters:
+			 *  (String) url Optional (sanitized) URL to clear a specific state.
+			 */
+			clearTabState: function(url) {
+				if(typeof(window.sessionStorage)=="undefined") return;
+
+				var s = window.sessionStorage;
+				if(url) {
+					s.removeItem('tabs-' + url);	
+				} else {
+					for(var i=0;i<s.length;i++) s.removeItem(s.key(i));
+				}
+			},
+
+			/**
+			 * Remove tab state for the current URL.
+			 */
+			clearCurrentTabState: function() {
+				this.clearTabState(this._tabStateUrl());
+			},
+
 			_tabStateUrl: function() {
 				return History.getState().url
 					.replace(/\?.*/, '')