Use Angular 1.5 one-way bindings where appropriate

Angular 1.5 introduces '<' as a way of specifying
that an isolate scope property is an input (one-way) binding.
Note that this is different from '::' (one-time) bindings from
ng 1.3.

See http://angularjs.blogspot.co.uk/2016/02/angular-150-ennoblement-facilitation.html
for details.

The principle benefit is making it obvious when looking
at the definition of a component whether a property is an input
or whether it is a binding that the component might write to.

h/static/scripts/directive/annotation.js

@@ -764,12 +764,12 @@ function annotation($document) {
     link: link,
     require: ['annotation', '?^thread', '?^threadFilter', '?^deepCount'],
     scope: {
-      annotation: '=',
+      annotation: '<',
       // Indicates whether this is the last reply in a thread.
-      isLastReply: '=',
-      replyCount: '=',
+      isLastReply: '<',
+      isSidebar: '<',
       onReplyCountClick: '&',
-      isSidebar: '='
+      replyCount: '<',
     },
     templateUrl: 'annotation.html'
   };

h/static/scripts/directive/dropdown-menu-btn.js

@@ -20,8 +20,8 @@ module.exports = function () {
     controllerAs: 'vm',
     restrict: 'E',
     scope: {
-      isDisabled: '=',
-      label: '=',
+      isDisabled: '<',
+      label: '<',
       dropdownMenuLabel: '@',
       onClick: '&',
       onToggleDropdown: '&',

h/static/scripts/directive/group-list.js

@@ -37,7 +37,7 @@ function groupList( $window, groups, settings) {
     },
     restrict: 'E',
     scope: {
-      auth: '='
+      auth: '<'
     },
     templateUrl: 'group_list.html'
   };

h/static/scripts/directive/markdown.coffee

@@ -363,7 +363,7 @@ module.exports = ['$filter', '$sanitize', '$sce', '$timeout', ($filter, $sanitiz
   require: '?ngModel'
   restrict: 'E'
   scope:
-    readOnly: '='
+    readOnly: '<'
     required: '@'
   templateUrl: 'markdown.html'
 ]

h/static/scripts/directive/publish-annotation-btn.js

@@ -29,9 +29,9 @@ module.exports = function () {
     controllerAs: 'vm',
     restrict: 'E',
     scope: {
-      group: '=',
-      canPost: '=',
-      isShared: '=',
+      group: '<',
+      canPost: '<',
+      isShared: '<',
       onCancel: '&',
       onSave: '&',
       onSetPrivacy: '&'

h/static/scripts/directive/search-status-bar.js

@@ -3,11 +3,11 @@ module.exports = function () {
   return {
     restrict: 'E',
     scope: {
-      filterActive: '=',
-      filterMatchCount: '=',
+      filterActive: '<',
+      filterMatchCount: '<',
       onClearSelection: '&',
-      searchQuery: '=',
-      selectionCount: '=',
+      searchQuery: '<',
+      selectionCount: '<',
     },
     templateUrl: 'search_status_bar.html',
   };

h/static/scripts/directive/signin-control.js

@@ -13,7 +13,7 @@ module.exports = function () {
       /**
        * An object representing the current authentication status.
        */
-      auth: '=',
+      auth: '<',
       /**
        * Called when the user clicks on the "Sign in" text.
        */
@@ -27,7 +27,7 @@ module.exports = function () {
        *
        * FIXME: should be removed when the old design is deprecated.
        */
-      newStyle: '=',
+      newStyle: '<',
     },
     templateUrl: 'signin_control.html',
   };

h/static/scripts/directive/simple-search.coffee

@@ -31,7 +31,7 @@ module.exports = ['$http', '$parse', ($http, $parse) ->
     # regardless of whether the it is focused or has an active query.
     #
     # If false, it is only expanded when focused or when 'query' is non-empty
-    alwaysExpanded: '='
+    alwaysExpanded: '<'
     query: '='
     onSearch: '&'
     onClear: '&'

h/static/scripts/directive/sort-dropdown.js

@@ -3,13 +3,13 @@ module.exports = function () {
     restrict: 'E',
     scope: {
       /** The name of the currently selected sort criteria. */
-      sortBy: '=',
+      sortBy: '<',
       /** A list of choices that the user can opt to sort by. */
-      sortOptions: '=',
+      sortOptions: '<',
       /** If true, the menu uses just an icon, otherwise
        * it displays 'Sorted by {{sortBy}}'
        */
-      showAsIcon: '=',
+      showAsIcon: '<',
       /** Called when the user changes the current sort criteria. */
       onChangeSortBy: '&',
     },

h/static/scripts/directive/top-bar.js

@@ -4,15 +4,15 @@ module.exports = function () {
   return {
     restrict: 'E',
     scope: {
-      auth: '=',
-      isSidebar: '=',
+      auth: '<',
+      isSidebar: '<',
       onLogin: '&',
       onLogout: '&',
-      searchController: '=',
-      accountDialog: '=',
-      shareDialog: '=',
-      sortBy: '=',
-      sortOptions: '=',
+      searchController: '<',
+      accountDialog: '<',
+      shareDialog: '<',
+      sortBy: '<',
+      sortOptions: '<',
       onChangeSortBy: '&',
     },
     templateUrl: 'top_bar.html',