[IMP] web: list: display help in header cell tooltip

Task 2036832

closes odoo/odoo#34939

Signed-off-by: VincentSchippefilt <VincentSchippefilt@users.noreply.github.com>

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

@@ -745,7 +745,7 @@ var ListRenderer = BasicRenderer.extend({
             $th.css({ textAlign: 'right' });
         }
 
-        if (config.isDebug()) {
+        if (config.isDebug() || node.attrs.help || field.help) {
             var fieldDescr = {
                 field: field,
                 name: name,

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

@@ -6521,6 +6521,37 @@ QUnit.module('Views', {
         list.destroy();
     });
 
+    QUnit.test('always display field help as toolip of header cells', async function (assert) {
+        assert.expect(6);
+
+        this.data.foo.fields.foo.help = "This is Foo field";
+        var list = await createView({
+            View: ListView,
+            model: 'foo',
+            data: this.data,
+            arch: `<tree>
+                    <field name="foo"/>
+                    <field name="bar" help="This is Bar field"/>
+                </tree>`,
+        });
+
+        var $fooHeader = list.$('th[data-name=foo]');
+        $fooHeader.tooltip('show', true);
+        $fooHeader.trigger($.Event('mouseenter'));
+        assert.containsOnce(document.body, '.oe_tooltip_string');
+        assert.strictEqual($('.oe_tooltip_string').text().trim(), 'Foo');
+        assert.strictEqual($('.oe_tooltip_help').text().trim(), 'This is Foo field');
+
+        var $barHeader = list.$('th[data-name=bar]');
+        $barHeader.tooltip('show', true);
+        $barHeader.trigger($.Event('mouseenter'));
+        assert.containsOnce(document.body, '.oe_tooltip_string');
+        assert.strictEqual($('.oe_tooltip_string').text().trim(), 'Bar');
+        assert.strictEqual($('.oe_tooltip_help').text().trim(), 'This is Bar field');
+
+        list.destroy();
+    });
+
     // TODO: write test on:
     // - default_get with a field not in view
 });