[imp] Sort messages by "Nr" not working

[Thomas Poisl]

Hello,

we have a strange Problem here. You can sort messages by everything, just
sorting them after "Nr" is just working ascending. If you click the arrow, the
symbols change to the descending order but the messages are sorted ascending by
"Nr.". All other sorting option like date, size and author are working
correctly.

Thanks for your answers.

Thomas Poisl

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