ENHANCEMENT When loading CMS, ensure that "Parent page" tree dropdown is

either hidden or shown depending on initial "Page location" state

code/model/SiteTree.php

@@ -1899,7 +1899,7 @@ class SiteTree extends DataObject implements PermissionProvider,i18nEntityProvid
 					$parentTypeSelector = new CompositeField(
 						new OptionsetField("ParentType", _t("SiteTree.PAGELOCATION", "Page location"), array(
 							"root" => _t("SiteTree.PARENTTYPE_ROOT", "Top-level page"),
-							"subpage" => _t("SiteTree.PARENTTYPE_SUBPAGE", "Sub-page underneath a parent page (choose below)"),
+							"subpage" => _t("SiteTree.PARENTTYPE_SUBPAGE", "Sub-page underneath a parent page"),
 						)),
 						$parentIDField = new TreeDropdownField("ParentID", $this->fieldLabel('ParentID'), 'SiteTree', 'ID', 'MenuTitle')
 					),

javascript/CMSMain.EditForm.js

@@ -275,7 +275,10 @@
 		 * radio button is selected
 		 */
 		$('.cms-edit-form.CMSPageSettingsController input[name="ParentType"]:checked').entwine({
-
+			onmatch: function() {
+				this.onclick();
+				this._super();
+			},
 			/**
 			 * Function: onclick
 			 *
@@ -286,7 +289,7 @@
 				var parentTreeDropDown = $('.cms-edit-form.CMSPageSettingsController #ParentID');
 
 				if (e.target.id == 'Form_EditForm_ParentType_root') parentTreeDropDown.slideUp();
-			  else parentTreeDropDown.slideDown();
+				else parentTreeDropDown.slideDown();
 			}
 		});
 

lang/en.yml

@@ -338,7 +338,7 @@ en:
     PARENTID: "Parent page"
     PARENTTYPE: "Page location"
     PARENTTYPE_ROOT: "Top-level page"
-    PARENTTYPE_SUBPAGE: "Sub-page underneath a parent page (choose below)"
+    PARENTTYPE_SUBPAGE: "Sub-page underneath a parent page"
     PERMISSION_GRANTACCESS_DESCRIPTION: "Manage access rights for content"
     PERMISSION_GRANTACCESS_HELP: "Allow setting of page-specific access restrictions in the \"Pages\" section."
     # Pural name of the object, used in dropdowns and to generally identify a collection of this object in the interface