[tex-k] Question about MetaFont online display

Igor Liferenko igor.liferenko at gmail.com
Tue Jun 20 16:04:58 CEST 2017

Hi all,

I would like to report a possible bug in MetaFont.

I have setup a test environment to reproduce it:

    git clone git://github.com/igor-liferenko/mf && cd mf
    make x
    ./mf test

In the output you will see redundant calls to blankrectangle and updatescreen:

This is METAFONT, Version 2.7182818 (TeX Live 2017) (preloaded base=mf)
initscreen called

blankrectangle called

updatescreen called

blankrectangle called

updatescreen called

Except these duplicate calls being useless, they may also cause undesirable
small initial blinking effect in an online display driver.

Anyway, these duplicate calls are strange and cause a question for
what they are needed.

Does anybody have an opinion on this?


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