vim-8.0.1035 using securecrt from vandyke and seeing this corrupting behaviour to all my sessions too.
Tried typing the escape sequence but it displays just a blank line: > cat ^[P$q q^[\ ^C -- -- You received this message from the "vim_dev" maillist. Do not top-post! Type your reply below the text you are replying to. For more information, visit http://www.vim.org/maillist.php --- You received this message because you are subscribed to the Google Groups "vim_dev" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. For more options, visit https://groups.google.com/d/optout.
