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patch 9.1.0116: win_split_ins may not check available room

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Problem:  win_split_ins has no check for E36 when moving an existing
          window
Solution: check for room and fix the issues in f_win_splitmove()
          (Sean Dewar)

win_split_ins has no check for E36 when moving an existing window,
allowing for layouts with many overlapping zero-sized windows to be
created (which may also cause drawing issues with tablines and such).
f_win_splitmove also has some bugs.

So check for room and fix the issues in f_win_splitmove. Handle failure
in the two relevant win_split_ins callers by restoring the original
layout, and factor the common logic into win_splitmove.

Don't check for room when opening an autocommand window, as it's a
temporary window that's rarely interacted with or drawn anyhow, and is
rather important for some autocommands.

Issues fixed in f_win_splitmove:
- Error if splitting is disallowed.
- Fix heap-use-after-frees if autocommands fired from switching to "targetwin"
  close "wp" or "oldwin".
- Fix splitting the wrong window if autocommands fired from switching to
  "targetwin" switch to a different window.
- Ensure -1 is returned for all errors.

Also handle allocation failure a bit earlier in make_snapshot (callers,
except win_splitmove, don't really care if a snapshot can't be made, so
just ignore the return value).

Note: Test_smoothscroll_in_zero_width_window failed after these changes with
E36, as it was using the previous behaviour to create a zero-width window.
I've fixed the test such that it fails with UBSAN as expected when v9.0.1367 is
reverted (and simplified it too).

related: #14042

Signed-off-by: Sean Dewar <6256228+seandewar@users.noreply.github.com>
Signed-off-by: Christian Brabandt <cb@256bit.org>
This commit is contained in:
Sean Dewar 2024-02-20 20:28:15 +01:00 committed by Christian Brabandt
parent 15935e7f54
commit 0fd44a5ad8
No known key found for this signature in database
GPG Key ID: F3F92DA383FDDE09
7 changed files with 355 additions and 106 deletions
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2
src/autocmd.c
View File

@ -1607,7 +1607,7 @@ aucmd_prepbuf(
p_acd = FALSE;
#endif
(void)win_split_ins(0, WSP_TOP, auc_win, 0);
(void)win_split_ins(0, WSP_TOP | WSP_FORCE_ROOM, auc_win, 0);
(void)win_comp_pos(); // recompute window positions
p_ea = save_ea;
#ifdef FEAT_AUTOCHDIR

70
src/evalwindow.c
View File

@ -952,60 +952,18 @@ f_win_screenpos(typval_T *argvars, typval_T *rettv)
list_append_number(rettv->vval.v_list, wp == NULL ? 0 : wp->w_wincol + 1);
}
/*
* Move the window wp into a new split of targetwin in a given direction
*/
static void
win_move_into_split(win_T *wp, win_T *targetwin, int size, int flags)
{
int dir;
int height = wp->w_height;
win_T *oldwin = curwin;
if (wp == targetwin)
return;
// Jump to the target window
if (curwin != targetwin)
win_goto(targetwin);
// Remove the old window and frame from the tree of frames
(void)winframe_remove(wp, &dir, NULL);
win_remove(wp, NULL);
last_status(FALSE); // may need to remove last status line
(void)win_comp_pos(); // recompute window positions
// Split a window on the desired side and put the old window there
(void)win_split_ins(size, flags, wp, dir);
// If splitting horizontally, try to preserve height
if (size == 0 && !(flags & WSP_VERT))
{
win_setheight_win(height, wp);
if (p_ea)
win_equal(wp, TRUE, 'v');
}
#if defined(FEAT_GUI)
// When 'guioptions' includes 'L' or 'R' may have to remove or add
// scrollbars. Have to update them anyway.
gui_may_update_scrollbars();
#endif
if (oldwin != curwin)
win_goto(oldwin);
}
/*
* "win_splitmove()" function
*/
void
f_win_splitmove(typval_T *argvars, typval_T *rettv)
{
win_T *wp;
win_T *targetwin;
win_T *wp, *targetwin;
win_T *oldwin = curwin;
int flags = 0, size = 0;
rettv->vval.v_number = -1;
if (in_vim9script()
&& (check_for_number_arg(argvars, 0) == FAIL
|| check_for_number_arg(argvars, 1) == FAIL
@ -1020,7 +978,6 @@ f_win_splitmove(typval_T *argvars, typval_T *rettv)
|| win_valid_popup(wp) || win_valid_popup(targetwin))
{
emsg(_(e_invalid_window_number));
rettv->vval.v_number = -1;
return;
}
@ -1040,7 +997,24 @@ f_win_splitmove(typval_T *argvars, typval_T *rettv)
size = (int)dict_get_number(d, "size");
}
win_move_into_split(wp, targetwin, size, flags);
// Check if we can split the target before we bother switching windows.
if (check_split_disallowed(targetwin) == FAIL)
return;
if (curwin != targetwin)
win_goto(targetwin);
// Autocommands may have sent us elsewhere or closed "wp" or "oldwin".
if (curwin == targetwin && win_valid(wp))
{
if (win_splitmove(wp, size, flags) == OK)
rettv->vval.v_number = 0;
}
else
emsg(_(e_autocommands_caused_command_to_abort));
if (oldwin != curwin && win_valid(oldwin))
win_goto(oldwin);
}
/*

4
src/proto/window.pro
View File

@ -4,7 +4,9 @@ win_T *prevwin_curwin(void);
win_T *swbuf_goto_win_with_buf(buf_T *buf);
void do_window(int nchar, long Prenum, int xchar);
void get_wincmd_addr_type(char_u *arg, exarg_T *eap);
int check_split_disallowed(win_T *wp);
int win_split(int size, int flags);
int win_splitmove(win_T *wp, int size, int flags);
int win_split_ins(int size, int flags, win_T *new_wp, int dir);
int win_valid_popup(win_T *win);
int win_valid(win_T *win);
@ -88,7 +90,7 @@ int only_one_window(void);
void check_lnums(int do_curwin);
void check_lnums_nested(int do_curwin);
void reset_lnums(void);
void make_snapshot(int idx);
int make_snapshot(int idx);
void restore_snapshot(int idx, int close_curwin);
int win_hasvertsplit(void);
int get_win_number(win_T *wp, win_T *first_win);

154
src/testdir/test_window_cmd.vim
View File

@ -290,6 +290,16 @@ func Test_window_split_no_room()
for s in range(1, hor_split_count) | split | endfor
call assert_fails('split', 'E36:')
botright vsplit
wincmd |
let layout = winlayout()
let restcmd = winrestcmd()
call assert_fails('wincmd J', 'E36:')
call assert_fails('wincmd K', 'E36:')
call assert_equal(layout, winlayout())
call assert_equal(restcmd, winrestcmd())
only
" N vertical windows need >= 2*(N - 1) + 1 columns:
" - 1 column + 1 separator for each window (except last window)
" - 1 column for the last window which does not have separator
@ -302,7 +312,35 @@ func Test_window_split_no_room()
for s in range(1, ver_split_count) | vsplit | endfor
call assert_fails('vsplit', 'E36:')
split
wincmd |
let layout = winlayout()
let restcmd = winrestcmd()
call assert_fails('wincmd H', 'E36:')
call assert_fails('wincmd L', 'E36:')
call assert_equal(layout, winlayout())
call assert_equal(restcmd, winrestcmd())
" Check that the last statusline isn't lost.
set laststatus=0
let restcmd = winrestcmd()
wincmd j
call setwinvar(winnr('k'), '&statusline', '@#')
let last_stl_row = win_screenpos(0)[0] - 1
redraw
call assert_equal('@#|', GetScreenStr(last_stl_row))
call assert_equal('~ |', GetScreenStr(&lines - &cmdheight))
call assert_fails('wincmd H', 'E36:')
call assert_fails('wincmd L', 'E36:')
call assert_equal(layout, winlayout())
call assert_equal(restcmd, winrestcmd())
call setwinvar(winnr('k'), '&statusline', '=-')
redraw
call assert_equal('=-|', GetScreenStr(last_stl_row))
call assert_equal('~ |', GetScreenStr(&lines - &cmdheight))
%bw!
set laststatus&
endfunc
func Test_window_exchange()
@ -1097,6 +1135,44 @@ func Test_win_splitmove()
tabnew
call assert_fails('call win_splitmove(1, win_getid(1, 1))', 'E957:')
tabclose
split
augroup WinSplitMove
au!
au WinEnter * ++once call win_gotoid(win_getid(winnr('#')))
augroup END
call assert_fails('call win_splitmove(winnr(), winnr("#"))', 'E855:')
augroup WinSplitMove
au!
au WinLeave * ++once quit
augroup END
call assert_fails('call win_splitmove(winnr(), winnr("#"))', 'E855:')
split
split
augroup WinSplitMove
au!
au WinEnter * ++once let s:triggered = v:true
\| call assert_fails('call win_splitmove(winnr("$"), winnr())', 'E242:')
augroup END
quit
call assert_equal(v:true, s:triggered)
unlet! s:triggered
new
augroup WinSplitMove
au!
au BufHidden * ++once let s:triggered = v:true
\| call assert_fails('call win_splitmove(winnr("#"), winnr())', 'E1159:')
augroup END
hide
call assert_equal(v:true, s:triggered)
unlet! s:triggered
au! WinSplitMove
augroup! WinSplitMove
%bw!
endfunc
" Test for the :only command
@ -2061,23 +2137,75 @@ func Test_new_help_window_on_error()
endfunc
func Test_smoothscroll_in_zero_width_window()
let save_lines = &lines
let save_columns = &columns
set cpo+=n number smoothscroll
set winwidth=99999 winminwidth=0
winsize 0 24
set cpo+=n
exe "noremap 0 \<C-W>n\<C-W>L"
norm 000000
set number smoothscroll
exe "norm \<C-Y>"
vsplit
call assert_equal(0, winwidth(winnr('#')))
call win_execute(win_getid(winnr('#')), "norm! \<C-Y>")
only!
let &lines = save_lines
let &columns = save_columns
set cpo-=n
unmap 0
set nonumber nosmoothscroll
set winwidth& winminwidth&
set cpo-=n nonumber nosmoothscroll
endfunc
func Test_splitmove_flatten_frame()
split
vsplit
wincmd L
let layout = winlayout()
wincmd K
wincmd L
call assert_equal(winlayout(), layout)
only!
endfunc
func Test_splitmove_autocmd_window_no_room()
" Open as many windows as possible
while v:true
try
split
catch /E36:/
break
endtry
endwhile
while v:true
try
vsplit
catch /E36:/
break
endtry
endwhile
wincmd j
vsplit
call assert_fails('wincmd H', 'E36:')
call assert_fails('wincmd J', 'E36:')
call assert_fails('wincmd K', 'E36:')
call assert_fails('wincmd L', 'E36:')
edit unload me
enew
bunload! unload\ me
augroup SplitMoveAucmdWin
au!
au BufEnter * ++once let s:triggered = v:true
\| call assert_equal('autocmd', win_gettype())
augroup END
let layout = winlayout()
let restcmd = winrestcmd()
" bufload opening the autocommand window shouldn't give E36.
call bufload('unload me')
call assert_equal(v:true, s:triggered)
call assert_equal(winlayout(), layout)
call assert_equal(winrestcmd(), restcmd)
unlet! s:triggered
au! SplitMoveAucmdWin
augroup! SplitMoveAucmdWin
%bw!
endfunc
" vim: shiftwidth=2 sts=2 expandtab

2
src/version.c
View File

@ -704,6 +704,8 @@ static char *(features[]) =
static int included_patches[] =
{ /* Add new patch number below this line */
/**/
116,
/**/
115,
/**/

1
src/vim.h
View File

@ -1255,6 +1255,7 @@ extern int (*dyn_libintl_wputenv)(const wchar_t *envstring);
#define WSP_BELOW 0x40 // put new window below/right
#define WSP_ABOVE 0x80 // put new window above/left
#define WSP_NEWLOC 0x100 // don't copy location list
#define WSP_FORCE_ROOM 0x200 // ignore "not enough room" errors
/*
* arguments for gui_set_shellsize()

228
src/window.c
View File

@ -17,7 +17,6 @@ static void frame_setheight(frame_T *curfrp, int height);
static void frame_setwidth(frame_T *curfrp, int width);
static void win_exchange(long);
static void win_rotate(int, int);
static void win_totop(int size, int flags);
static void win_equal_rec(win_T *next_curwin, int current, frame_T *topfr, int dir, int col, int row, int width, int height);
static void trigger_winnewpre(void);
static void trigger_winclosed(win_T *win);
@ -31,7 +30,7 @@ static void win_fix_cursor(int normal);
static void frame_new_height(frame_T *topfrp, int height, int topfirst, int wfh);
static int frame_fixed_height(frame_T *frp);
static int frame_fixed_width(frame_T *frp);
static void frame_add_statusline(frame_T *frp);
static void frame_add_statusline(frame_T *frp, int adjust_winheight);
static void frame_new_width(frame_T *topfrp, int width, int leftfirst, int wfw);
static void frame_add_vsep(frame_T *frp);
static int frame_minwidth(frame_T *topfrp, win_T *next_curwin);
@ -55,12 +54,15 @@ static void win_goto_hor(int left, long count);
static void frame_add_height(frame_T *frp, int n);
static void last_status_rec(frame_T *fr, int statusline);
static void make_snapshot_rec(frame_T *fr, frame_T **frp);
static int make_snapshot_rec(frame_T *fr, frame_T **frp, int snap_wins);
static void clear_snapshot(tabpage_T *tp, int idx);
static void clear_snapshot_rec(frame_T *fr);
static int check_snapshot_rec(frame_T *sn, frame_T *fr);
static win_T *restore_snapshot_rec(frame_T *sn, frame_T *fr);
static win_T *get_snapshot_curwin(int idx);
static frame_T *make_full_snapshot(void);
static void restore_full_snapshot(frame_T *sn);
static void restore_full_snapshot_rec(frame_T *sn);
static int frame_check_height(frame_T *topfrp, int height);
static int frame_check_width(frame_T *topfrp, int width);
@ -494,9 +496,15 @@ newwindow:
case 'H':
case 'L':
CHECK_CMDWIN;
win_totop((int)Prenum,
((nchar == 'H' || nchar == 'L') ? WSP_VERT : 0)
| ((nchar == 'H' || nchar == 'K') ? WSP_TOP : WSP_BOT));
if (ONE_WINDOW)
beep_flush();
else
{
int dir = ((nchar == 'H' || nchar == 'L') ? WSP_VERT : 0)
| ((nchar == 'H' || nchar == 'K') ? WSP_TOP : WSP_BOT);
(void)win_splitmove(curwin, (int)Prenum, dir);
}
break;
// make all windows the same width and/or height
@ -858,18 +866,18 @@ cmd_with_count(
}
/*
* If "split_disallowed" is set give an error and return FAIL.
* If "split_disallowed" is set for "wp", give an error and return FAIL.
* Otherwise return OK.
*/
static int
check_split_disallowed(void)
int
check_split_disallowed(win_T *wp)
{
if (split_disallowed > 0)
{
emsg(_(e_cant_split_window_while_closing_another));
return FAIL;
}
if (curwin->w_buffer->b_locked_split)
if (wp->w_buffer->b_locked_split)
{
emsg(_(e_cannot_split_window_when_closing_buffer));
return FAIL;
@ -898,7 +906,7 @@ win_split(int size, int flags)
if (ERROR_IF_ANY_POPUP_WINDOW)
return FAIL;
if (check_split_disallowed() == FAIL)
if (check_split_disallowed(curwin) == FAIL)
return FAIL;
// When the ":tab" modifier was used open a new tab page instead.
@ -968,7 +976,7 @@ win_split_ins(
// add a status line when p_ls == 1 and splitting the first window
if (ONE_WINDOW && p_ls == 1 && oldwin->w_status_height == 0)
{
if (VISIBLE_HEIGHT(oldwin) <= p_wmh && new_wp == NULL)
if (!(flags & WSP_FORCE_ROOM) && VISIBLE_HEIGHT(oldwin) <= p_wmh)
{
emsg(_(e_not_enough_room));
goto theend;
@ -1026,7 +1034,7 @@ win_split_ins(
available = oldwin->w_frame->fr_width;
needed += minwidth;
}
if (available < needed && new_wp == NULL)
if (!(flags & WSP_FORCE_ROOM) && available < needed)
{
emsg(_(e_not_enough_room));
goto theend;
@ -1109,7 +1117,7 @@ win_split_ins(
available = oldwin->w_frame->fr_height;
needed += minheight;
}
if (available < needed && new_wp == NULL)
if (!(flags & WSP_FORCE_ROOM) && available < needed)
{
emsg(_(e_not_enough_room));
goto theend;
@ -1360,7 +1368,7 @@ win_split_ins(
if (!((flags & WSP_BOT) && p_ls == 0))
new_fr_height -= STATUS_HEIGHT;
if (flags & WSP_BOT)
frame_add_statusline(curfrp);
frame_add_statusline(curfrp, FALSE);
frame_new_height(curfrp, new_fr_height, flags & WSP_TOP, FALSE);
}
else
@ -1900,35 +1908,69 @@ win_rotate(int upwards, int count)
}
/*
* Move the current window to the very top/bottom/left/right of the screen.
* Move "wp" into a new split in a given direction, possibly relative to the
* current window.
* "wp" must be valid in the current tabpage.
* Returns FAIL for failure, OK otherwise.
*/
static void
win_totop(int size, int flags)
int
win_splitmove(win_T *wp, int size, int flags)
{
int dir;
int height = curwin->w_height;
int height = wp->w_height;
frame_T *frp;
if (ONE_WINDOW)
return OK; // nothing to do
if (check_split_disallowed(wp) == FAIL)
return FAIL;
// Undoing changes to frames if splitting fails is complicated.
// Save a full snapshot to restore instead.
frp = make_full_snapshot();
if (frp == NULL)
{
beep_flush();
return;
emsg(_(e_out_of_memory));
return FAIL;
}
if (check_split_disallowed() == FAIL)
return;
// Remove the window and frame from the tree of frames.
(void)winframe_remove(curwin, &dir, NULL);
win_remove(curwin, NULL);
(void)winframe_remove(wp, &dir, NULL);
win_remove(wp, NULL);
last_status(FALSE); // may need to remove last status line
(void)win_comp_pos(); // recompute window positions
// Split a window on the desired side and put the window there.
(void)win_split_ins(size, flags, curwin, dir);
if (!(flags & WSP_VERT))
// Split a window on the desired side and put "wp" there.
if (win_split_ins(size, flags, wp, dir) == FAIL)
{
win_setheight(height);
// Restore the previous layout from the snapshot.
vim_free(wp->w_frame);
restore_full_snapshot(frp);
// Vertical separators to the left may have been lost. Restore them.
frp = wp->w_frame;
if (frp->fr_parent->fr_layout == FR_ROW && frp->fr_prev != NULL)
frame_add_vsep(frp->fr_prev);
// Statuslines above may have been lost. Restore them.
if (frp->fr_parent->fr_layout == FR_COL && frp->fr_prev != NULL)
frame_add_statusline(frp->fr_prev, TRUE);
win_append(wp->w_prev, wp);
return FAIL;
}
clear_snapshot_rec(frp);
// If splitting horizontally, try to preserve height.
if (size == 0 && !(flags & WSP_VERT))
{
win_setheight_win(height, wp);
if (p_ea)
win_equal(curwin, TRUE, 'v');
{
// Equalize windows. Note that win_split_ins autocommands may have
// made a window other than "wp" current.
win_equal(curwin, curwin == wp, 'v');
}
}
#if defined(FEAT_GUI)
@ -1936,6 +1978,7 @@ win_totop(int size, int flags)
// scrollbars. Have to update them anyway.
gui_may_update_scrollbars();
#endif
return OK;
}
/*
@ -3849,30 +3892,34 @@ frame_fixed_width(frame_T *frp)
/*
* Add a status line to windows at the bottom of "frp".
* Note: Does not check if there is room!
* If "adjust_winheight" is set, reduce the height of windows without a
* statusline to accommodate one; otherwise, there is no check for room!
*/
static void
frame_add_statusline(frame_T *frp)
frame_add_statusline(frame_T *frp, int adjust_winheight)
{
win_T *wp;
if (frp->fr_layout == FR_LEAF)
{
wp = frp->fr_win;
if (adjust_winheight && wp->w_status_height == 0
&& wp->w_height >= STATUS_HEIGHT) // don't make it negative
wp->w_height -= STATUS_HEIGHT - wp->w_status_height;
wp->w_status_height = STATUS_HEIGHT;
}
else if (frp->fr_layout == FR_ROW)
{
// Handle all the frames in the row.
FOR_ALL_FRAMES(frp, frp->fr_child)
frame_add_statusline(frp);
frame_add_statusline(frp, adjust_winheight);
}
else // frp->fr_layout == FR_COL
{
// Only need to handle the last frame in the column.
for (frp = frp->fr_child; frp->fr_next != NULL; frp = frp->fr_next)
;
frame_add_statusline(frp);
frame_add_statusline(frp, adjust_winheight);
}
}
@ -7498,29 +7545,44 @@ reset_lnums(void)
/*
* Create a snapshot of the current frame sizes.
* "idx" is SNAP_HELP_IDX or SNAP_AUCMD_IDX.
* Return FAIL if out of memory, OK otherwise.
*/
void
int
make_snapshot(int idx)
{
clear_snapshot(curtab, idx);
make_snapshot_rec(topframe, &curtab->tp_snapshot[idx]);
if (make_snapshot_rec(topframe, &curtab->tp_snapshot[idx], FALSE) == FAIL)
{
clear_snapshot(curtab, idx);
return FAIL;
}
return OK;
}
static void
make_snapshot_rec(frame_T *fr, frame_T **frp)
static int
make_snapshot_rec(frame_T *fr, frame_T **frp, int snap_wins)
{
*frp = ALLOC_CLEAR_ONE(frame_T);
if (*frp == NULL)
return;
return FAIL;
(*frp)->fr_layout = fr->fr_layout;
(*frp)->fr_width = fr->fr_width;
(*frp)->fr_height = fr->fr_height;
if (fr->fr_next != NULL)
make_snapshot_rec(fr->fr_next, &((*frp)->fr_next));
{
if (make_snapshot_rec(fr->fr_next, &((*frp)->fr_next), snap_wins)
== FAIL)
return FAIL;
}
if (fr->fr_child != NULL)
make_snapshot_rec(fr->fr_child, &((*frp)->fr_child));
if (fr->fr_layout == FR_LEAF && fr->fr_win == curwin)
(*frp)->fr_win = curwin;
{
if (make_snapshot_rec(fr->fr_child, &((*frp)->fr_child), snap_wins)
== FAIL)
return FAIL;
}
if (fr->fr_layout == FR_LEAF && (snap_wins || fr->fr_win == curwin))
(*frp)->fr_win = fr->fr_win;
return OK;
}
/*
@ -7657,6 +7719,86 @@ restore_snapshot_rec(frame_T *sn, frame_T *fr)
return wp;
}
/*
* Return a snapshot of all frames in the current tabpage and which windows are
* in them, or NULL if out of memory.
* Use clear_snapshot_rec to free the snapshot.
*/
static frame_T *
make_full_snapshot(void)
{
frame_T *frp;
if (make_snapshot_rec(topframe, &frp, TRUE) == FAIL)
{
clear_snapshot_rec(frp);
return NULL;
}
return frp;
}
/*
* Restore all frames in the full snapshot "sn" for the current tabpage.
* Caller must ensure that the screen size didn't change, no windows with frames
* in the snapshot were freed, and windows with frames not in the snapshot are
* removed from their frames!
* Doesn't restore changed window vertical separators or statuslines.
* Frees the old frames. Don't call clear_snapshot_rec on "sn" afterwards!
*/
static void
restore_full_snapshot(frame_T *sn)
{
if (sn == NULL)
return;
clear_snapshot_rec(topframe);
restore_full_snapshot_rec(sn);
curtab->tp_topframe = topframe = sn;
last_status(FALSE);
// If the amount of space available changed, first try setting the sizes of
// windows with 'winfix{width,height}'. If that doesn't result in the right
// size, forget about that option.
if (topframe->fr_width != Columns)
{
frame_new_width(topframe, Columns, FALSE, TRUE);
if (!frame_check_width(topframe, Columns))
frame_new_width(topframe, Columns, FALSE, FALSE);
}
if (topframe->fr_height != ROWS_AVAIL)
{
frame_new_height(topframe, ROWS_AVAIL, FALSE, TRUE);
if (!frame_check_height(topframe, ROWS_AVAIL))
frame_new_height(topframe, ROWS_AVAIL, FALSE, FALSE);
}
win_comp_pos();
}
static void
restore_full_snapshot_rec(frame_T *sn)
{
if (sn == NULL)
return;
if (sn->fr_child != NULL)
sn->fr_child->fr_parent = sn;
if (sn->fr_next != NULL)
{
sn->fr_next->fr_parent = sn->fr_parent;
sn->fr_next->fr_prev = sn;
}
if (sn->fr_win != NULL)
{
sn->fr_win->w_frame = sn;
// Resize window to fit the frame.
frame_new_height(sn, sn->fr_height, FALSE, FALSE);
frame_new_width(sn, sn->fr_width, FALSE, FALSE);
}
restore_full_snapshot_rec(sn->fr_child);
restore_full_snapshot_rec(sn->fr_next);
}
#if defined(FEAT_GUI) || defined(PROTO)
/*
* Return TRUE if there is any vertically split window.