FileFieldWidgetTest fails on local sites running in a subdirectory

The Needs Review Queue Bot → tested this issue. It either no longer applies to Drupal core, or fails the Drupal core commit checks. Therefore, this issue status is now "Needs work".

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Re-roll patch #10 against Drupal 9.5.x
Patch #10 is not applied for Drupal 9.5.x so Inter-diff file is not added.

Checking patch core/modules/file/tests/src/Functional/FileFieldWidgetTest.php...
Hunk #1 succeeded at 94 (offset 2 lines).
Hunk #2 succeeded at 267 (offset 2 lines).
Hunk #3 succeeded at 335 (offset 4 lines).
Hunk #4 succeeded at 353 (offset 5 lines).
error: while searching for:
    $this->assertEqual($attacker_user->id(), $node_file->getOwnerId(), 'New file belongs to the attacker.');

    // Ensure the file can be downloaded.
    $this->drupalGet($node_file->createFileUrl());
    $this->assertSession()->statusCodeEquals(200);

    // "Click" the remove button (emulating either a nojs or js submission).

error: patch failed: core/modules/file/tests/src/Functional/FileFieldWidgetTest.php:564
error: core/modules/file/tests/src/Functional/FileFieldWidgetTest.php: patch does not apply