[FIX] web: display download button if not dirty

Steps to reproduce:
-------------------
For example:
- add a work permit file to an employee (private information tab);
- try to download it before saving;

Issue:
------
The old file is downloaded or a traceback occurs
if there was no file before.

Cause:
------
When downloading, we use the `/web/content` endpoint.
We will try to read the record in the backend via `_record_to_stream`.
The record is not yet saved in database.

Solution:
---------
Disable download button if record is dirty.

opw-3458842

closes odoo/odoo#134521

Signed-off-by: Michaël Mattiello (mcm) <mcm@odoo.com>

addons/web/static/src/views/fields/binary/binary_field.xml

@@ -10,7 +10,7 @@
                         file="{ data: props.value, name: fileName }"
                         onUploaded.bind="update"
                     >
-                        <t t-if="props.record.resId">
+                        <t t-if="props.record.resId and !props.record.isDirty">
                             <button
                                 class="btn btn-secondary fa fa-download"
                                 data-tooltip="Download"

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

@@ -254,6 +254,36 @@ QUnit.module("Fields", (hooks) => {
         );
     });
 
+    QUnit.test("BinaryField is correctly rendered (isDirty)", async function (assert) {
+        assert.expect(2);
+
+        await makeView({
+            serverData,
+            type: "form",
+            resModel: "partner",
+            arch: `
+                <form>
+                    <field name="document" filename="foo"/>
+                    <field name="foo"/>
+                </form>`,
+            resId: 1,
+        });
+        // Simulate a file upload
+        const file = new File(["test"], "fake_file.txt", { type: "text/plain" });
+        await editInput(target, ".o_field_binary .o_input_file", file);
+        assert.containsNone(
+            target,
+            '.o_field_widget[name="document"] .fa-download',
+            "the binary field should not be rendered as a downloadable since the record is dirty"
+        );
+        await clickSave(target);
+        assert.containsOnce(
+            target,
+            '.o_field_widget[name="document"] .fa-download',
+            "the binary field should render as a downloadable link since the record is not dirty"
+        );
+    });
+
     QUnit.test("file name field is not defined", async (assert) => {
         await makeView({
             serverData,