The FileWidget::process() should check element keys (upload_button and remove_button) before changing their #ajax settings since it can break widgets using FileWidget as their base. In particular
VisualN →
uses file field and widget for VisualN file and widget respectively to allow users to upload data files to create visualizations.
Needs work
10.1 ✨
The change is currently missing an automated test that fails when run with the original code, and succeeds when the bug has been fixed.
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