Problem (reported by @itchyny)

On :terminal on terminal-application with support for bracketed-paste, paste (e.g. Cmd-V on macOS) may not work properly.

Repro steps

The case of zsh:

vim --clean +'term zsh'

and paste text "echo hello", then an extra character ~ is appended.

Detail

When user pastes "echo hello", Vim receives \e[200~echo hello\e[201~ and trys to send it to :terminal, but the end sequence \e[201~ is separated from the body of paste-text and then zsh will interpret it as mere ~ character.

expected:

in << \e[200~echo hello\e[201~
out>> echo hello

actual:

in << \e[200~echo hello
out>> echo hello
in << \e[201~
out>> ~

in << means "Vim sends to :term zsh", and out>> means the echoback from tty.

Cause

terminal.c:861 term_convert_key()

        case K_PS:              vterm_keyboard_start_paste(vterm); return 0;
        case K_PE:              vterm_keyboard_end_paste(vterm); return 0;

When there is an input of bracketed-paste sequence \e[200~ or \e[201~, it is stored to vtrem buffer and is not sent at this time; then it will be sent to tty together with next input.
Therefore the end sequence \e[201~ is not sent at the time of doing paste.