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fix(wininfo): when freeing windows, free the lowest priority wininfo
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On master (and also before #31539) closing a window could cause the
used wininfo for a buffer to change. This is due to always removing the
previous NULL wininfo when deleting a window, even if that wininfo had
higher priority than the the deleted window's own wininfo.
Instead delete the wininfo with lowest priority. This retains the memory
saving efect while not affecting the effective value of window options
and so on.
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Problem:
- API functions using `try_start` directly, do not surface the
underlying error message, and instead show generic messages.
- Error-handling code is duplicated in the API impl.
- Failure modes are not tested.
Solution:
- Use `TRY_WRAP`.
- Add tests.
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Problem:
- API functions using `try_start` directly instead of `TRY_WRAP`, do not
surface the underlying error message, and instead show generic things
like "Failed to set buffer".
- Error handling code is duplicated in the API impl, instead of
delegating to the vim buffer/window handling logic.
Solution:
- Use `TRY_WRAP`.
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Before calling "attach" a screen object is just a dummy container for
(row, col) values whose purpose is to be sent as part of the "attach"
function call anyway.
Just create the screen in an attached state directly. Keep the complete
(row, col, options) config together. It is still completely valid to
later detach and re-attach as needed, including to another session.
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This mostly means replacing `nvim_buf_call` and `nvim_win_call` with
`vim._with`.
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\
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Specifically, functions that are run in the context of the test runner
are put in module `test/testutil.lua` while the functions that are run
in the context of the test session are put in
`test/functional/testnvim.lua`.
Closes https://github.com/neovim/neovim/issues/27004.
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Revert commit c971f538ab87b537ae4c97bd44167661c5691a2d.
Forcing grid cursor position will need a new API like originally proposed in #27858.
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Problem: Renaming non-current buffer changes working directory when
'autochdir' is set.
Solution: Temporarily disable 'autochdir'. Add more tests for the
win_set_buf change.
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Problem: Wrong working directory when setting buffer in another window with
'autochdir' enabled.
Solution: Temporarily disable 'autochdir'.
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Problem: noautocmd is confusing; despite its name, it doesn't block all
autocommands (instead it blocks only those related to setting the buffer), and
is commonly used by plugins to open windows while producing minimal
side-effects.
Solution: be consistent and block all autocommands when noautocmd is set.
This includes WinNew (again), plus autocommands from entering the window (if
enter is set) like WinEnter, WinLeave, TabEnter, .etc.
See the discussion at https://github.com/neovim/neovim/pull/14659#issuecomment-2040029517
for more information.
Remove win_set_buf's noautocmd argument, as it's no longer needed.
NOTE: pum_create_float_preview sets noautocmd for win_set_buf, but all its
callers already use block_autocmds.
Despite that, pum_create_float_preview doesn't actually properly handle
autocommands (it has no checks for whether those from win_enter or
nvim_create_buf free the window).
For now, ensure autocommands are blocked within it for correctness (in case it's
ever called outside of a block_autocmds context; the function seems to have been
refactored in #26739 anyway).
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Work on https://github.com/neovim/neovim/issues/27004.
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Problem: Cursor position set by nvim_win_set_cursor() is not reflected
on the screen when followed by a blocking call like getchar().
Solution: Immediately update the cursor position on the grid.
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Problem: nvim_win_set_config does not update the tp_curwin of win's original
tabpage when moving it to another.
Solution: update it if win was the tp_curwin. Add a test.
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Problem: nvim_win_set_config does not update statuslines after removing a split.
Solution: call last_status.
Didn't realize this was missing in the original nvim_win_set_config for splits
PR.
As it can only be done for the current tabpage, do it if win_tp == curtab;
enter_tabpage will eventually call last_status anyway when the user enters
another tabpage.
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Problem: there are new ways to escape textlock or break the cmdwin in
nvim_win_set_config and nvim_tabpage_set_win.
Solution: fix them. Use win_goto to check it in nvim_tabpage_set_win and use the
try_start/end pattern like with similar functions such as nvim_set_current_win
(which uses the existing msg_list, if set).
Careful not to use `wp->handle` when printing the window ID in the error message
for nvim_tabpage_set_win, as win_goto autocommands may have freed the window.
On a related note, I have a feeling some API functions ought to be checking
curbuf_locked...
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Problem: nvim_win_set_config does not handle failure in win_split_ins properly
yet, which can cause all sorts of issues. Also nvim_open_win and
nvim_win_set_config do not set the error message to the one from win_split_ins.
Solution: handle failure by undoing winframe_remove, like in win_splitmove.
Make sure autocommands from switching to the altwin fire within a valid window,
and ensure they don't screw things up. Set the error message to that of
win_split_ins, if any.
Also change a few other small things, including:
- adjust win_append to take a tabpage_T * argument, which is more consistent
with win_remove (and also allows us to undo a call to win_remove).
- allow winframe_restore to restore window positions. Useful if `wp` was in a
different tabpage, as a call to win_comp_pos (which only works for the current
tabpage) after winframe_restore should no longer be needed.
Though enter_tabpage calls win_comp_pos anyway, this has the advantage of
ensuring w_winrow/col remains accurate even before entering the tabpage
(useful for stuff like win_screenpos, if used on a window in another tabpage).
(This change should probably also be PR'd to Vim later, even though it doesn't
use winframe_restore for a `wp` in a different tabpage yet).
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Problem: nvim_open_win blocking all win_set_buf autocommands when !enter &&
!noautocmd is too aggressive.
Solution: temporarily block WinEnter/Leave and BufEnter/Leave events when
setting the buffer. Delegate the firing of BufWinEnter back to win_set_buf,
which also has the advantage of keeping the timing consistent (e.g: before the
epilogue in enter_buffer, which also handles restoring the cursor position if
autocommands didn't change it, among other things). Reword the documentation for
noautocmd a bit.
I pondered modifying do_buffer and callees to allow for BufEnter/Leave being
conditionally disabled, but it seems too invasive (and potentially error-prone,
especially if new code paths to BufEnter/Leave are added in the future).
Unfortunately, doing this has the drawback of blocking ALL such events for the
duration, which also means blocking unrelated such events; like if window
switching occurs in a ++nested autocmd fired by win_set_buf. If this turns out
to be a problem in practice, a different solution specialized for nvim_open_win
could be considered. :-)
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Problem: currently, for splits, nvim_win_set_config accepts win without any of
split or vertical set, which has little effect and seems error-prone.
Solution: require at least one of split or vertical to also be set for splits.
Also, update nvim_win_set_config docs, as it's no longer limited to just
floating and external windows.
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Problem: splitting is disallowed in some cases to prevent the window layout
changes while a window is closing, but it's not checked for.
Solution: check for this, and set the API error message directly.
(Also sneak in a change to tui.c that got lost from #27352; it's a char* buf,
and the memset is assuming one byte each anyway)
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Problem: WinNew and win_enter autocommands can delete the target buffer to
switch to, causing a heap-use-after-free.
Solution: store a bufref to the buffer, check it before attempting to switch.
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Problem: if switch_win{_noblock} fails to restore the old curwin after WinNew
(e.g: it was closed), wp will become the new curwin, but win_set_buf enter
events would still be blocked if !enter && !noautocmd.
Solution: fire them, as we've actually entered the new window.
Note: there's a problem of switch_win{_noblock} failing to restore the old
curwin, leaving us in wp without triggering WinEnter/WinLeave, but this affects
all callers of switch_win{_noblock} anyways. (It's also not clear how WinLeave
can be called if the old curwin was closed already).
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Problem: BufWinEnter is not fired when not entering a new window, even when a
different buffer is specified and buffer-related autocommands are unblocked
(!noautocmd).
Solution: fire it in the context of the new window and buffer. Do not do it if
the buffer is unchanged, like :{s}buffer.
Be wary of autocommands! For example, it's possible for nvim_win_set_config to
be used in an autocommand to move a window to a different tabpage (in contrast,
things like wincmd T actually create a *new* window, so it may not have been
possible before, meaning other parts of Nvim could assume windows can't do
this... I'd be especially cautious of logic that restores curwin and curtab
without checking if curwin is still valid in curtab, if any such logic exists).
Also, bail early from win_set_buf if setting the temp curwin fails; this
shouldn't be possible, as the callers check that wp is valid, but in case that's
not true, win_set_buf will no longer continue setting a buffer for the wrong
window.
Note that pum_create_float_preview also uses win_set_buf, but from a glance,
doesn't look like it properly checks for autocmds screwing things up (win_enter,
nvim_create_buf...). I haven't addressed that here.
Also adds some test coverage for nvim_open_win autocommands.
Closes #27121.
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Problem: win_set_config should have the observable effect of moving an existing
window to another place, but instead fires autocommands as if a new window was
created and entered (and does not fire autocommands reflecting a "return" to the
original window).
Solution: do not fire win_enter-related autocommands when splitting the window,
but continue to fire them when entering the window that fills the new space when
moving a window to a different tabpage, as the new curwin changes.
Also, remove "++once" from the WinEnter autocmd in the other test, as omitting
it also crashed Nvim before this fix.
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Problem: win_enter autocommands can close new_curwin, crashing if it was the
last window in its tabpage after removing win, or can close parent, crashing
when attempting to split it later.
Solution: remove win first, check that parent is valid after win_enter.
NOTE: This isn't actually quite right, as this means win is not in the window
list or even has a frame when triggering enter autocommands (so it's not
considered valid in the tabpage). This is addressed in later commits.
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Adds support to `nvim_open_win` and `nvim_win_set_config` for creating
and manipulating split (non-floating) windows.
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Problem: Things that temporarily change/restore curwin/buf (e.g:
win_execute, some autocmds) may break assumptions that
curwin/buf is the cmdwin when "cmdwin_type != 0", causing
issues.
Solution: Expose the cmdwin's real win/buf and check that instead. Also
try to ensure these variables are NULL if "cmdwin_type == 0",
allowing them to be used directly in most cases without
checking cmdwin_type. (Sean Dewar)
Reset and save `cmdwin_old_curwin` in a similar fashion.
Apply suitable changes for API functions and add Lua tests.
https://github.com/vim/vim/commit/988f74311c26ea9917e84fbae608de226dba7e5f
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- remove helpers.cur*meths
- remove helpers.nvim
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This is the command invoked repeatedly to make the changes:
:%s/^\(.*\)|\%(\*\(\d\+\)\)\?$\n\1|\%(\*\(\d\+\)\)\?$/\=submatch(1)..'|*'..(max([str2nr(submatch(2)),1])+max([str2nr(submatch(3)),1]))/g
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A command typed in the cmdwin and executed with `<CR>` is expected to be
executed in the context of the old curwin/buf, so it shouldn't be changed.
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This aligns its behaviour better with `nvim_win_close`.
Note that `:hide` is actually incapable of closing the cmdwin, unlike `:close`
and `:quit`, so this is a bit of a difference in behaviour.
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Disallow closing the previous window from `nvim_win_close`, as this will cause
issues.
Again, no telling how safe this is. It also requires exposing old_curwin. :/
Also note that it's possible for the `&cmdheight` to change if, for example,
there are 2 tabpages and `nvim_win_close` is used to close the last window in
the other tabpage while `&stal` is 1. This is addressed in a later commit.
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Problem: As discussed on Matrix, there was some interest in having
`nvim_open_win` again be able to open floats in the cmdwin (e.g: displaying a
hover doc related to what's in the cmdwin). After #23228, this was disallowed.
Solution: Allow `nvim_open_win` in the cmdwin as long as `!enter` and
`buffer != curbuf` (the former can cause all sorts of issues, and the latter
can crash Nvim after closing cmdwin). Also allow `nvim_win_set_buf` in a similar
fashion.
Note that we're not *entirely* sure if this is 100% safe (cmdwin is a
global-state-using-main-loop-calling beast), but this seems to work OK..?
Also:
- Check the buffer argument of `nvim_open_win` earlier, and abort if it's
invalid (it used to still open a window in this case).
- Untranslate `e_cmdwin` errors in the API (other errors in the API are not
translated: although not detailed in the API contract yet, errors are
supposed to be stable).
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It uses the same code as "scroll_delta" of "win_viewport" UI event to
calculate text height, but is more flexible.
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