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

[Alex]

I don't know how to reproduce this outside of `xterm-mouse-mode', but
this seems to be an issue with `input-decode-map' in TTY.

Examples (from emacs -Q -nw with `xterm-mouse-mode' enabled):

1. C-h k <mouse-1>

This will open the help buffer for the click, but also insert the
control sequence for the click.

This also happens when modifying the click with Alt xor Ctrl.

2. <M-mouse-1>

This will insert the click control sequence when releasing the button.

3. I'm not sure, but I wouldn't be surprised if Bug#29143 is also an
example of this. I don't know why it only happens in evil-mode, though.


I don't see anything on the `xterm-mouse-mode' side that would cause the
above since in `turn-on-xterm-mouse-tracking-on-terminal' "\e[<" (the
prefix of the control sequences inserted above) is added to
`input-decode-map', and its binding, `xterm-mouse--read-event-sequence',
isn't called whenever the sequence is inserted.