[FIX] web: fixed crash in editable grouped lists

Adding a line in grouped listviews caused a crash in some cases.

Steps to reproduce:
- go in any grouped editable list view
- click on any "Add a line" cell, but not on the link itself
- press ENTER

Before this commit:
A crash occured. Unable to add a new line. Needed to refresh the page.

After this commit:
Line addition functionnality properly working even when selecting the outer cell

addons/web/static/src/js/views/list/list_editable_renderer.js

@@ -1035,7 +1035,10 @@ ListRenderer.include({
         ev.stopPropagation();
 
         var self = this;
-        var groupId = $(ev.target).data('group-id');
+        // This method can be called when selecting the parent of the link.
+        // We need to ensure that the link is the actual target
+        const target = ev.target.tagName !== 'A' ? ev.target.getElementsByTagName('A')[0] : ev.target;
+        const groupId = target.dataset.groupId;
         this.currentGroupId = groupId;
         this.unselectRow().then(function () {
             self.trigger_up('add_record', {
@@ -1195,7 +1198,7 @@ ListRenderer.include({
                             var correspondingRow = self._getRow(recordId);
                             correspondingRow.children().eq(cellIndex).focus();
                         } else if (self.currentGroupId) {
-                                self.$('a[data-group-id=' + self.currentGroupId + ']').focus();
+                            self.$('a[data-group-id="' + self.currentGroupId + '"]').focus();
                         } else {
                             self.$('.o_field_x2many_list_row_add a:first').focus(); // FIXME
                         }

addons/web/static/tests/views/list_tests.js

@@ -6273,6 +6273,28 @@ QUnit.module('Views', {
         list.destroy();
     });
 
+    QUnit.test('add and discard a line through keyboard navigation without crashing', async function (assert) {
+        assert.expect(2);
+
+        var list = await createView({
+            View: ListView,
+            model: 'foo',
+            data: this.data,
+            arch: '<tree editable="bottom"><field name="foo" required="1"/></tree>',
+            groupBy: ['bar'],
+        });
+
+        await testUtils.dom.click(list.$('.o_group_header:first')); // open group
+        // Triggers ENTER on "Add a line" wrapper cell
+        await testUtils.fields.triggerKeydown(list.$('.o_group_field_row_add'), 'enter');
+        assert.containsN(list, 'tbody:nth(1) .o_data_row', 4, "new data row should be created");
+        await testUtils.dom.click(list.$buttons.find('.o_list_button_discard'));
+        // At this point, a crash manager should appear if no proper link targetting
+        assert.containsN(list, 'tbody:nth(1) .o_data_row', 3,"new data row should be discarded.");
+
+        list.destroy();
+    });
+
     QUnit.test('editable grouped list with create="0"', async function (assert) {
         assert.expect(1);