vim-patch:9.1.1550: defaults: 'showcmd' is not enabled in non-compatible mode on Unix

Problem:  defaults: 'showcmd' is not enabled in non-compatible mode on
          Unix
Solution: Always enable 'showcmd' in non-compatible mode, drop it from
          defaults.vim.

'showcmd' was already always enabled in Vim compatible mode except for
UNIX environments. So let's just enable it always, there is no good
reason why UNIX platforms should be handled differently than other
platforms, especially since `defaults.vim` did enable this option
anyhow.

closes: vim/vim#17739

https://github.com/vim/vim/commit/3f9d2378bd70748fc59e02a402422269bd096492

Co-authored-by: Christian Brabandt <cb@256bit.org>

runtime/doc/vim_diff.txt

@@ -77,7 +77,6 @@ Defaults                                            *defaults* *nvim-defaults*
 - 'ruler' is enabled
 - 'sessionoptions' includes "unix,slash", excludes "options"
 - 'shortmess' includes "CF", excludes "S"
-- 'showcmd' is enabled
 - 'sidescroll' defaults to 1
 - 'smarttab' is enabled
 - 'spellfile' defaults to `stdpath("data").."/site/spell/"`

test/old/testdir/setup.vim

@@ -19,7 +19,7 @@ if exists('s:did_load')
   set listchars=eol:$
   set maxsearchcount=99
   set mousemodel=extend
-  set nohidden nosmarttab noautoindent noautoread noruler noshowcmd
+  set nohidden nosmarttab noautoindent noautoread noruler
   set nohlsearch noincsearch
   set nrformats=bin,octal,hex
   set sessionoptions+=options

test/old/testdir/test_display.vim

@@ -187,10 +187,13 @@ func Test_edit_long_file_name()
 
   let longName = 'x'->repeat(min([&columns, 255]))
   call writefile([], longName, 'D')
-  let buf = RunVimInTerminal('-N -u NONE ' .. longName, #{rows: 8})
+  let buf = RunVimInTerminal('-N -u NONE --cmd ":set noshowcmd" ' .. longName, #{rows: 8})
 
   call VerifyScreenDump(buf, 'Test_long_file_name_1', {})
 
+  call term_sendkeys(buf, ":set showcmd\<cr>:e!\<cr>")
+  call VerifyScreenDump(buf, 'Test_long_file_name_2', {})
+
   " clean up
   call StopVimInTerminal(buf)
 endfunc

test/old/testdir/test_options.vim

@@ -2903,4 +2903,16 @@ func Test_set_missing_options()
   set w9600=23
 endfunc
 
+func Test_showcmd()
+  throw 'Skipped: Nvim does not support support Vi-compatible mode'
+  " in no-cp mode, 'showcmd' is enabled
+  let _cp=&cp
+  call assert_equal(1, &showcmd)
+  set cp
+  call assert_equal(0, &showcmd)
+  set nocp
+  call assert_equal(1, &showcmd)
+  let &cp = _cp
+endfunc
+
 " vim: shiftwidth=2 sts=2 expandtab