Unsaved changes warning not compatible with Edit component

[st-the-cloud]

In an Edit component, when 'warnWhenUnsavedChanges' is set in the child SimpleForm component, I would expect the delete button to still work like normal.

Instead, if I press 'Delete' after making changes to a field, I get the unsaved changes warning, and if I ignore it (i.e. click cancel) the page stays on the now stale Edit page and things stop working correctly (for example, pressing save results in a Not Found error).

To reproduce, simply set warnWhenUnsavedChanges in the SimpleForm component of an Edit component, then go to the edit component, begin editing a field, then press delete (if mutation mode is set to pessimistic, click OK on the delete confirmation modal).

React-admin version: 5.14.6
React version: 19.2.5
Browser: Google Chrome 149.0.7827.103

[fzaninotto]

Thanks for the report. I can confirm the bug.

The problem is that DeleteButton causes a redirect, which triggers the warnWhenUnsavedChanges warning. Whatever the user replies, the result is the same: the warning's cancel button modifies the form, but the DeleteButton doesn't deal with the form.