1 files changed, 38 insertions, 0 deletions
diff --git a/addons/mail/static/src/bugfix/bugfix.js b/addons/mail/static/src/bugfix/bugfix.js
index 1253e69da8e..162bf606db5 100644
--- a/addons/mail/static/src/bugfix/bugfix.js
+++ b/addons/mail/static/src/bugfix/bugfix.js
@@ -10,6 +10,44 @@ odoo.define('mail/static/src/bugfix/bugfix.js', function (require) {
 });
 
 // Should be moved to its own file in master.
+odoo.define('mail/static/src/component_hooks/use_rendered_values/use_rendered_values.js', function (require) {
+'use strict';
+
+const { Component } = owl;
+const { onMounted, onPatched } = owl.hooks;
+
+/**
+ * This hooks provides support for accessing the values returned by the given
+ * selector at the time of the last render. The values will be updated after
+ * every mount/patch.
+ *
+ * @param {function} selector function that will be executed at the time of the
+ *  render and of which the result will be stored for future reference.
+ * @returns {function} function to call to retrieve the last rendered values.
+ */
+function useRenderedValues(selector) {
+    const component = Component.current;
+    let renderedValues;
+    let patchedValues;
+
+    const __render = component.__render.bind(component);
+    component.__render = function () {
+        renderedValues = selector();
+        return __render(...arguments);
+    };
+    onMounted(onUpdate);
+    onPatched(onUpdate);
+    function onUpdate() {
+        patchedValues = renderedValues;
+    }
+    return () => patchedValues;
+}
+
+return useRenderedValues;
+
+});
+
+// Should be moved to its own file in master.
 odoo.define('mail/static/src/component_hooks/use_update/use_update.js', function (require) {
 'use strict';