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fix(api): disallow some more functions during textlock

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Problem: nvim_buf_set_text(), nvim_open_term() and termopen() all change buffer
text, which is forbidden during textlock. Additionally, nvim_open_term() and
termopen() may be used to convert the cmdwin buffer into a terminal buffer,
which is weird.

Solution: Allow nvim_buf_set_text() and nvim_open_term() in the cmdwin, but
disallow nvim_open_term() from converting the cmdwin buffer into a terminal
buffer. termopen() is not allowed in the cmdwin (as it always operates on
curbuf), so just check text_locked().

Also happens to improve the error in #21055: nvim_buf_set_text() was callable
during textlock, but happened to check textlock indirectly via u_save();
however, this caused the error to be overwritten by an unhelpful "Failed to
save undo information" message when msg_list == NULL (e.g: an `<expr>` mapping
invoked outside of do_cmdline()).
This commit is contained in:
Sean Dewar
2023-06-23 22:32:07 +01:00
parent 77118d0da8
commit aa4e47f704
6 changed files with 52 additions and 1 deletions
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5
src/nvim/eval/funcs.c
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@@ -8385,7 +8385,10 @@ static void f_termopen(typval_T *argvars, typval_T *rettv, EvalFuncData fptr)
if (check_secure()) {
return;
}
if (text_locked()) {
text_locked_msg();
return;
}
if (curbuf->b_changed) {
emsg(_("Can only call this function in an unmodified buffer"));
return;