Hi.
Doing ":redraw" during external command causes strange screen state and cursor
position.
[repro steps]
test.vim
----
" for clarity of screen state
colorscheme morning
syntax on
function! Callback(timer) abort
redraw
"quit
endfunction
call timer_start(1000, 'Callback')
:!ls
----
vim -Nu NONE -S test.vim
starting, after ":!ls" and ":redraw" in timer callback:
cursor is positioned on the right of "help version7<Enter>"
https://cloud.githubusercontent.com/assets/18260849/17743470/cadaca1e-64de-11e6-9c95-cd3a0f5111a3.png
entering insert mode:
"~" of empty line prefix isn't drawn.
https://cloud.githubusercontent.com/assets/18260849/17743478/cfacf242-64de-11e6-922d-0411f7a59c5e.png
quiting:
intro remains.
https://cloud.githubusercontent.com/assets/18260849/17743483/d48c6e1e-64de-11e6-9d77-a96709b15c4c.png
[cause/detail]
Terminal goes into inconsistent state.
normal sequence of executing external command:
----
do_shell
stoptermcap // switch to normal screen buffer (T_TE [DECRST 1049]),
termcap_active=FALSE
call_shell
mch_call_shell
settmode(TMODE_COOK)
[:!ls]
settmode(TMODE_RAW)
wait_return
starttermcap // switch to alt-screen buffer (T_TI [DECSET 1049]),
termcap_active=TRUE
----
case-1: this problem
----
do_shell
stoptermcap // switch to normal screen buffer
call_shell
(snip)
wait_return
(firing timer)
ex_redraw // draw intro on normal (NOT alt-) screen buffer
(waiting key-input)
starttermcap // switch to alt-screen buffer
(snip)
// on exiting, restore to normal screen buffer (== intro)
----
case-2: uncommenting ":quit" in callback
----
do_shell
stoptermcap // switch to normal screen buffer
call_shell
(snip)
wait_return
(timer発火)
ex_redraw // draw intro on normal (NOT alt-) screen buffer
ex_quit
getout
(exit) // :quit
----
[patch]
- check "termcap_active" in screen_valid(), except GUI.
(on GUI, this prevents executing external command)
https://gist.github.com/ichizok/4fe3853dbc7cc2e67c4a994e59fc5ee8
Thank you.
- Ozaki Kiichi
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