bug#29150: Fwd: 26.0.90; Input decoding is sometimes skipped in TTY (xterm-mouse-mode)

[Alex]

Olaf Rogalsky <olaf.rogalsky@t-online.de> writes:

> Hi,

Hi,

Thanks for looking into this. It looks like the only issue remaining is
#2 (M-mouse-1).

> PSS: I don't think, that #29143 is related. Both, `Evil-mode' *and*
>      `xterm-mouse-mode' fool around with the ?\e prefix in the
>      `input-decode-map', but they obviously do it in an incompatible
>      way.

It's not that. I checked out evil-mode's code and found out that it uses
a modified ~6 year old version of `mouse-drag-track', which evidently
doesn't play too well with recent Emacs versions.

For example, try using the definitions of `mouse-drag-region' and
`mouse-drag-track' of Emacs 24 in Emacs 25/26. Then in
`xterm-mouse-mode', releasing `mouse-1' inserts the control sequence
into the current buffer (which is what Bug#29143 is, except in
evil-mode, the characters in the sequence are not all bound to
`self-insert-command').

This old code uses `read-event', which, as you mentioned in your other
reply, doesn't use `input-decode-map'. Replacing it with:

  (aref (read-key-sequence-vector nil) 0)

fixes Bug#29143.

Eli, Stefan, does it make sense that `read-event' doesn't take into
account `input-decode-map'? If so, then is there a better alternative to
the above workaround? Perhaps there could be a new optional argument to
`read-event'?