Problem: current window number returned by tabpagewinnr may be outdated
when called from win_execute for the original tabpage.
Solution: update the original tabpage's tp_curwin in switch_win; use
{un}use_tabpage instead. Don't do it in restore_win to ensure
tp_curwin of the temporarily visited tabpage is unchanged from
switch_win visiting it, as before. (Sean Dewar)
Maybe restore_win should only restore tp_curwin if
`curtab == switchwin->sw_curtab`, in case the user changed tabpages from within
win_execute, but not doing that is consistent with the old behaviour.
related: vim/vim#14186https://github.com/vim/vim/commit/e101028a5c896480c61fef7ea16855255925709b
Problem: Crash on exit with EXITFREE and using win_execute().
Solution: Also save and restore tp_topframe. (issue vim/vim#9374)
https://github.com/vim/vim/commit/dab17a0689a2f31f69f428975f84b0c3c7ba3030
Couldn't repro the crash in the test, but I only care about this patch so
switch_win sets topframe properly for win_split_ins in nvim_open_win and
nvim_win_set_config.
Add a test using nvim_win_call and :wincmd, as I couldn't repro the issue via
nvim_open_win or nvim_win_set_config (though it's clear they're affected by this
patch).
That said, at that point, could just use {un}use_tabpage inside switch_win
instead, which also updates tp_curwin (though maybe continue to not set it in
restore_win). That would also fix possible inconsistent behaviour such as:
:call win_execute(w, "let curwin_nr1 = tabpagewinnr(1)")
:let curwin_nr2 = tabpagewinnr(1)
Where it's possible for curwin_nr1 != curwin_nr2 if these commands are run from
the 1st tabpage, but window "w" is in the 2nd (as the 1st tabpage's tp_curwin
may still be invalid). I'll probably PR a fix for that later in Vim.
Co-authored-by: Bram Moolenaar <Bram@vim.org>
Sean Dewar