When using heirloom `vi` originally written by Bill Joy (`:version`
gives me "Version 4.0 (gritter) 12/25/06"), its possible to store text into
registers 1-9 and subsequently use the `:edit` or `:next` command to
change files and paste the contents of those numbered registers,
contrary to what Vim documentation states.
POSIX description also does not mention such a restriction:
https://pubs.opengroup.org/onlinepubs/9799919799/utilities/ex.html#tag_20_40_13_10closes: #15814
Signed-off-by: Frederick Key Abell III <fkabell@localhost.localdomain>
Signed-off-by: Christian Brabandt <cb@256bit.org>