keyboard errors in DOS, found links to similar errors for reference

This bug has been copied automatically from: https://bugs.launchpad.net/qemu/+bug/1899539
Reported by 'p kirkham' on 2020-10-12 :

OS: slackware 14.2, updated. qemu version: 4.1.0 (from slackbuild script)

command line: qemu-system-i386 -hda msdos.vhd

Description of problem: MSDOS 6.22 disk image running gwbasic 3.23. Cursor
keys and sometimes letter keys are repeated. Cursor keys seemingly always,
letter keys seem to happen when typing too fast.  Numpad arrows are not
affected.  Also insert key doesnt seem to work at all.

Have found one similar current bug, Bug #1574246 Drunken keyboard in
go32v2 programs https://bugs.launchpad.net/qemu/+bug/1574246?comments=all
and a much older vbox bug report that seems very similar,
https://www.virtualbox.org/ticket/58 , and for some reason mentions a qemu
patch.