[FIX] web: parent access in button context broken

Before this commit, accessing parent in a button context broke the button
throwing `EvaluationError: Name 'parent' is not defined`.

to fix,the proxy object `params.evalContext` was passed to `evaluateExpr`
similar to examples seen in `list_renderer.js`

closes odoo/odoo#102293

X-original-commit: 90afb529969ce7de83a20060f5c35a64ce4cf971
Signed-off-by: Aaron Bohy (aab) <aab@odoo.com>
Signed-off-by: Ahmed Khalaf  <ahkh@odoo.com>

addons/web/static/src/views/view_button/view_button_hook.js

@@ -71,8 +71,7 @@ export function useViewButtons(model, ref, options = {}) {
                 let buttonContext = {};
                 if (clickParams.context) {
                     if (typeof clickParams.context === "string") {
-                        const valuesForEval = Object.assign({}, params.evalContext);
-                        buttonContext = evaluateExpr(clickParams.context, valuesForEval);
+                        buttonContext = evaluateExpr(clickParams.context, params.evalContext);
                     } else {
                         buttonContext = clickParams.context;
                     }

addons/web/static/tests/views/fields/one2many_field_tests.js

@@ -9018,6 +9018,33 @@ QUnit.module("Fields", (hooks) => {
         assert.verifySteps(["do_something"]);
     });
 
+    QUnit.test("o2m button with parent in context", async function (assert) {
+        await makeView({
+            type: "form",
+            resModel: "partner",
+            serverData,
+            resId: 1,
+            arch: `
+                <form>
+                    <field name="turtles">
+                        <tree>
+                            <field name="display_name"/>
+                            <button string="Action Button" name="test_button" type="object" context="{'parent_name': parent.display_name}"/>
+                        </tree>
+                    </field>
+                </form>`,
+            mockRPC(route, args) {
+                if (args.method === "test_button") {
+                    assert.step("test_button");
+                    assert.strictEqual(args.kwargs.context.parent_name, 'first record');
+                    return true;
+                }
+            },
+        });
+        await click(target, 'button[name="test_button"]');
+        assert.verifySteps(["test_button"]);
+    });
+
     QUnit.test("o2m add a line custom control create align with handle", async function (assert) {
         await makeView({
             type: "form",