Syncing from upstream OCA/server-tools (19.0) - #2085
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…falsy value When the previous version set a field explicitly and the new version omits it, _get_xml_diff generated eval="False" using field.falsy_value. This is wrong for fields whose default is truthy (e.g. ir.rule.perm_read/write/create/unlink or active): a fresh install applies the field's default, not its falsy value. The generated noupdate_changes.xml then mismatched a clean install and could even violate model constraints (e.g. ir.rule's _no_access_rights CHECK), breaking the migration. Use model.default_get() to reset omitted fields to the value a fresh install would give them, falling back to falsy_value when there is no default or it is not a scalar.
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