New issue by hallyn on mblaze repository

https://github.com/leahneukirchen/mblaze/issues/208

Description:
If I do 'mscan' after an 'mseq -S', it shows the sequence.  If I do 'mscan < /dev/null', it shows nothing.  If I do "mscan' again, it shows all messages again.  I noticed this when running mscan inside a script launched through dmenu.  Doing 'mseq | mscan' worked around it in that script, but this seemed unintentional based on the code.