vim-patch:9.0.0845: shell command with just space gives strange error (#21029)

Problem:    Shell command with just space gives strange error.
Solution:   Skip white space at start of the argument. (Christian Brabandt,
            Shane-XB-Qian, closes vim/vim#11515, closes vim/vim#11495)

https://github.com/vim/vim/commit/4e7590ec00483077daaa567aa2220bc8df912f3c

Co-authored-by: shane.xb.qian <shane.qian@foxmail.com>

1 files changed, 47 insertions, 0 deletions

diff --git a/src/nvim/testdir/test_cmdline.vim b/src/nvim/testdir/test_cmdline.vim
index b0be7ab396..2921c8b41a 100644
--- a/src/nvim/testdir/test_cmdline.vim
+++ b/src/nvim/testdir/test_cmdline.vim
@@ -1628,6 +1628,53 @@ func Test_cmd_bang_E135()
   %bwipe!
 endfunc
 
+func Test_cmd_bang_args()
+  new
+  :.!
+  call assert_equal(0, v:shell_error)
+
+  " Note that below there is one space char after the '!'.  This caused a
+  " shell error in the past, see https://github.com/vim/vim/issues/11495.
+  :.! 
+  call assert_equal(0, v:shell_error)
+  bwipe!
+
+  CheckUnix
+  :.!pwd
+  call assert_equal(0, v:shell_error)
+  :.! pwd
+  call assert_equal(0, v:shell_error)
+
+  " Note there is one space after 'pwd'.
+  :.! pwd 
+  call assert_equal(0, v:shell_error)
+
+  " Note there are two spaces after 'pwd'.
+  :.!  pwd  
+  call assert_equal(0, v:shell_error)
+  :.!ls ~
+  call assert_equal(0, v:shell_error)
+
+  " Note there is one space char after '~'.
+  :.!ls  ~ 
+  call assert_equal(0, v:shell_error)
+
+  " Note there are two spaces after '~'.
+  :.!ls  ~  
+  call assert_equal(0, v:shell_error)
+
+  :.!echo "foo"
+  call assert_equal(getline('.'), "foo")
+  :.!echo "foo  "
+  call assert_equal(getline('.'), "foo  ")
+  :.!echo " foo  "
+  call assert_equal(getline('.'), " foo  ")
+  :.!echo  " foo  "
+  call assert_equal(getline('.'), " foo  ")
+
+  %bwipe!
+endfunc
+
 " Test for using ~ for home directory in cmdline completion matches
 func Test_cmdline_expand_home()
   call mkdir('Xdir')