diff --git a/web_group_expand/__manifest__.py b/web_group_expand/__manifest__.py
index c98849280..b45446b37 100644
--- a/web_group_expand/__manifest__.py
+++ b/web_group_expand/__manifest__.py
@@ -4,17 +4,11 @@
     "version": "12.0.1.0.0",
     "license": "AGPL-3",
     "author": "OpenERP SA, "
-              "AvanzOSC, "
-              "Serv. Tecnol. Avanzados - Pedro M. Baeza, "
-              "Therp BV, "
-              "Odoo Community Association (OCA)",
-    "depends": [
-        "web",
-    ],
-    "qweb": [
-        "static/src/xml/expand_buttons.xml",
-    ],
-    "data": [
-        "views/templates.xml",
-    ],
+    "AvanzOSC, "
+    "Serv. Tecnol. Avanzados - Pedro M. Baeza, "
+    "Therp BV, "
+    "Odoo Community Association (OCA)",
+    "depends": ["web",],
+    "qweb": ["static/src/xml/expand_buttons.xml",],
+    "data": ["views/templates.xml",],
 }
diff --git a/web_group_expand/static/src/js/web_group_expand.js b/web_group_expand/static/src/js/web_group_expand.js
index 290d0645e..d2de1768e 100644
--- a/web_group_expand/static/src/js/web_group_expand.js
+++ b/web_group_expand/static/src/js/web_group_expand.js
@@ -4,47 +4,61 @@ odoo.define("web.web_group_expand", function(require) {
     var qweb = require("web.core").qweb;
 
     require("web.ListController").include({
-        start: function () {
+        start: function() {
             this.$expandGroupButtons = $(qweb.render("web_group_expand.Buttons"));
-            this.$expandGroupButtons.find("#oe_group_by_expand").on(
-                "click", this.expandAllGroups.bind(this)
-            );
-            this.$expandGroupButtons.find("#oe_group_by_collapse").on(
-                "click", this.collapseAllGroups.bind(this)
-            );
+            this.$expandGroupButtons
+                .find("#oe_group_by_expand")
+                .on("click", this.expandAllGroups.bind(this));
+            this.$expandGroupButtons
+                .find("#oe_group_by_collapse")
+                .on("click", this.collapseAllGroups.bind(this));
             return this._super.apply(this, arguments);
         },
 
-        renderPager: function ($node) {
+        renderPager: function($node) {
             this._super.apply(this, arguments);
             this.$expandGroupButtons.toggleClass("o_hidden", !this.renderer.isGrouped);
             $node.append(this.$expandGroupButtons);
         },
 
-        expandAllGroups: function () {
+        expandAllGroups: function() {
             // We expand layer by layer. So first we need to find the highest
             // layer that's not already fully expanded.
             var layer = this.renderer.state.data;
             while (layer.length) {
-                var closed = layer.filter(function (group) {return !group.isOpen;});
+                var closed = layer.filter(function(group) {
+                    return !group.isOpen;
+                });
                 if (closed.length) {
                     // This layer is not completely expanded, expand it
                     this._toggleGroups(closed);
                     break;
                 }
                 // This layer is completely expanded, move to the next
-                layer = _.flatten(layer.map(function (group) {return group.data;}), true);
+                layer = _.flatten(
+                    layer.map(function(group) {
+                        return group.data;
+                    }),
+                    true
+                );
             }
         },
 
-        collapseAllGroups: function () {
+        collapseAllGroups: function() {
             // We collapse layer by layer. So first we need to find the deepest
             // layer that's not already fully collapsed.
-            var layer = this.renderer.state.data
-                .filter(function (group) {return group.isOpen;});
+            var layer = this.renderer.state.data.filter(function(group) {
+                return group.isOpen;
+            });
             while (layer.length) {
-                var next = _.flatten(layer.map(function (group) {return group.data;}), true)
-                    .filter(function (group) {return group.isOpen;});
+                var next = _.flatten(
+                    layer.map(function(group) {
+                        return group.data;
+                    }),
+                    true
+                ).filter(function(group) {
+                    return group.isOpen;
+                });
                 if (!next.length) {
                     // Next layer is fully collapsed, so collapse this one
                     this._toggleGroups(layer);
@@ -54,19 +68,24 @@ odoo.define("web.web_group_expand", function(require) {
             }
         },
 
-        _toggleGroups: function (groups) {
+        _toggleGroups: function(groups) {
             var self = this;
-            var defs = groups.map(function (group) {
+            var defs = groups.map(function(group) {
                 return self.model.toggleGroup(group.id);
             });
-            $.when(...defs).then(this.update.bind(this, {}, {keepSelection: true, reload: false}));
-        }
+            $.when(...defs).then(
+                this.update.bind(this, {}, {keepSelection: true, reload: false})
+            );
+        },
     });
 
     require("web.ListRenderer").include({
-        updateState: function () {
+        updateState: function() {
             var res = this._super.apply(this, arguments);
-            $("nav.oe_group_by_expand_buttons").toggleClass("o_hidden", !this.isGrouped);
+            $("nav.oe_group_by_expand_buttons").toggleClass(
+                "o_hidden",
+                !this.isGrouped
+            );
             return res;
         },
     });
diff --git a/web_group_expand/static/src/xml/expand_buttons.xml b/web_group_expand/static/src/xml/expand_buttons.xml
index 3f3b55ff7..68b8e2ba0 100644
--- a/web_group_expand/static/src/xml/expand_buttons.xml
+++ b/web_group_expand/static/src/xml/expand_buttons.xml
@@ -1,15 +1,19 @@
-<?xml version="1.0" encoding="UTF-8"?>
+<?xml version="1.0" encoding="UTF-8" ?>
 <templates>
     <t t-name="web_group_expand.Buttons">
         <nav class="btn-group oe_group_by_expand_buttons o_hidden">
-            <button class="btn btn-secondary fa fa-expand"
-                    id="oe_group_by_expand"
-                    title="Expand groups"
-                    type="button" />
-            <button class="btn btn-secondary fa fa-compress"
-                    id="oe_group_by_collapse"
-                    title="Collapse groups"
-                    type="button" />
+            <button
+                class="btn btn-secondary fa fa-expand"
+                id="oe_group_by_expand"
+                title="Expand groups"
+                type="button"
+            />
+            <button
+                class="btn btn-secondary fa fa-compress"
+                id="oe_group_by_collapse"
+                title="Collapse groups"
+                type="button"
+            />
         </nav>
     </t>
 </templates>
diff --git a/web_group_expand/views/templates.xml b/web_group_expand/views/templates.xml
index 0864cf845..9a2baa5ba 100644
--- a/web_group_expand/views/templates.xml
+++ b/web_group_expand/views/templates.xml
@@ -1,8 +1,15 @@
-<?xml version="1.0" encoding="utf-8"?>
+<?xml version="1.0" encoding="utf-8" ?>
 <odoo>
-    <template id="assets_backend" name="web_groupby_expand assets" inherit_id="web.assets_backend">
+    <template
+        id="assets_backend"
+        name="web_groupby_expand assets"
+        inherit_id="web.assets_backend"
+    >
         <xpath expr="." position="inside">
-            <script type="text/javascript" src="/web_group_expand/static/src/js/web_group_expand.js"></script>
+            <script
+                type="text/javascript"
+                src="/web_group_expand/static/src/js/web_group_expand.js"
+            />
         </xpath>
     </template>
 </odoo>