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QtDownload: fix error signal (#7612)

QtDownload: fix error signal and use pointer-to-member syntax for connections.
Also fix debug messages.
M
Marcin Pączkowski committed
22c354b23514eab23283c8d79810cf84bcd33023
Parent: 766efaf
Committed by GitHub <noreply@github.com> on 7/5/2026, 12:11:55 PM