Tests for autocommands on :close command

Write three files and open them, each in a window.
Then go to next window, with autocommand that deletes the previous one.
Do this twice, writing the file.

Also test deleting the buffer on a Unload event.  If this goes wrong there
will be the ATTENTION prompt.

Also test changing buffers in a BufDel autocommand.  If this goes wrong there
are ml_line errors and/or a Crash.

STARTTEST
:so small.vim
:/^start of testfile/,/^end of testfile/w! Xtestje1
:/^start of testfile/,/^end of testfile/w! Xtestje2
:/^start of testfile/,/^end of testfile/w! Xtestje3
:e Xtestje1
otestje1
:w
:sp Xtestje2
otestje2
:w
:sp Xtestje3
otestje3
:w

:au WinLeave Xtestje2 bwipe

:w! test.out
:au WinLeave Xtestje1 bwipe Xtestje3
:close
:w >>test.out
:e Xtestje1
:bwipe Xtestje2 Xtestje3 test.out
:au!
:au! BufUnload Xtestje1 bwipe
:e Xtestje3
:w >>test.out
:e Xtestje2
:sp Xtestje1
:e
:w >>test.out
:au!
:only
:e Xtestje1
:bwipe Xtestje2 Xtestje3 test.out test13.in
:au BufWipeout Xtestje1 buf Xtestje1
:bwipe
:w >>test.out
:qa!
ENDTEST

start of testfile
	contents
	contents
	contents
end of testfile