Make an encrypted export importable again

[blaipr]

The bug

An encrypted export could not be restored. Not "failed with an error" — it died on an uncaught PHP fatal, for any export containing so much as one category, client, tag or account. That is every real backup anybody has taken.

SyspassImport::processEncrypted() parsed the decrypted fragment into a DOMDocument without setting preserveWhiteSpace = false — unlike XmlFile, which does set it for the file itself. XmlExport writes with formatOutput = true, so the fragment is pretty-printed: the indentation arrives as DOMText nodes and is grafted into the main tree by importNode(…, true).

The first one then reaches a CallbackFilterIterator callback typed DOMElement $element, and the TypeError that raises is an Error, not an Exception — so neither SyspassImport::doImport()'s catch (Exception) nor the repository transaction's catches it.

Reproduced standalone before touching anything:

TypeError: {closure}(): Argument #1 ($e) must be of type DOMElement, DOMText given

The fix

One line: the same preserveWhiteSpace = false the unencrypted path has always had.

The test that found it

A new export→import round trip, which is the property neither half's tests covered: both were tested against themselves, so nothing said what the export writes is what the import can read.

It creates a category, a client, two tags and an account with a real password through the real services, exports, imports back, and requires every field to match — name, login, url, notes, category and client by name, tags, and the decrypted password. Not "no exception was thrown".

Three cases: plain, encrypted with the right password, and encrypted with the wrong one (still refused cleanly). The encrypted case fails against the old code with exactly the TypeError above.

It builds a real container against a real database by hand, the way CliTestCase does, because IntegrationTestCase mocks the database away and nothing would actually persist to read back.

Testing

Integration suite green: 855. Import unit tests: 54. PHPStan and PHPCS clean.