Editor manager: Abort with a single message if file is not readable.
We show a dialog that offers opening a file in a different editor type if opening a file fails, but we should not do that if opening the file fails because it is not readable. With this change, documents now specify if they failed to open a file because reading failed, or because they could not handle the file contents. Task-number: QTCREATORBUG-14495 Change-Id: I5d4b7cfa74b87ef21b9b55bc30b3ebe2f8238dfa Reviewed-by: Daniel Teske <email@example.com> Reviewed-by: Leena Miettinen <firstname.lastname@example.org>
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