[vim/vim] 'mksession' does not take 'bdelete' into account (#1393)

[fmv1992]

There are two examples on vim_use list:

1. https://groups.google.com/forum/#!topic/vim_use/4Nun47Jsjvc
2. https://groups.google.com/forum/#!topic/vim_use/qL4--7akXS4

What happens is that mksesion! does not honor bdelete!.

Full working example:

/tmp/abcde » touch a b buffer_to_be_deleted
/tmp/abcde » vim -p a b buffer_to_be_deleted
3 files to edit
--------------------- Inside Vim --------------------- 
bd buffer_to_be_deleted
mksession! /tmp/session.vim
buffers

:buffers
  1 %a   "a"                            line 1
  2  a   "b"                            line 0
--------------------- Outside Vim --------------------- 
/tmp/abcde »
/tmp/abcde » ls
a  b  buffer_to_be_deleted
/tmp/abcde » vim -S /tmp/session.vim
--------------------- Inside Vim --------------------- 
buffers

:buffers
  2 %a   "a"                            line 1
  3      "b"                            line 1
  4  a   "buffer_to_be_deleted"         line 0
--------------------- Outside Vim --------------------- 

I would not expect the line
4 a "buffer_to_be_deleted" line 0
to be there.

This happens with sessionoptions including 'buffers' and without.

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[Bram Moolenaar]

This happens because buffer_to_be_deleted is in the argument list. When the session is loaded and the argument list is re-created the buffer is also added.
We could add the buffer in hidden state to avoid the problem.

[Blake Watkins]

You can clear the arglist (:argd *) before executing mksession. If you want to restore the arguments to the arglist, you could write a little script that saves the array of args (use 'argv()' in vimscript), perform the arglist clear, then set args to the saved array.