Re: Command history scrolling after less

On 2019-02-14, Paul wrote:
> ":<up>" normally scrolls through command history. However, after
> I pipe the buffer to less, that no longer happens. With or without
> any LESS* environment variables set:
>
> 1. vim -Nu NONE
> 2. :<up> " Fine
> 3. <esc> " To cancel the scrolling from step 2
> 4. :w !less
> 5. Press "q", "enter", or whatever to get back to Vim
> 5. :<up> " Not fine, back to normal mode
>
> This doesn't appear to be an issue in gvim, nor does it happen
> when piped to more or cat instead of less, so I'm wondering if
> this is a less issue rather than a vim one.

I can reproduce this using:

Vim 8.1.865
less 481
GNOME Terminal 2.32.0

Also, when I exit vim with :q, the screen is not cleared.

Less seems to redefine the escape sequences coming from the arrow
keys. Before executing ":w !less" in the above demonstration,
I entered insert mode and typed ^V before typing each of the arrow
keys, in the order <Up>, <Down>, <Right>, <Left>. The result was

^[OA^[OB^[OC^[OD

where ^[ is Vim's representation of <Esc>. After executing ":w
!less" and quitting less, the result of inserting the same key
sequence was

^[[A^[[B^[[C^[[D

I also reproduced the problem with a few combinations of Vim
7.3.315, less 436, xterm 261 and xterm 322 as well as the versions
above.

Regards,
Gary

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