feat(defaults): set nojoinspaces

runtime/doc/options.txt

@@ -3498,7 +3498,7 @@ A jump table for the options with a short description can be found at |Q_op|.
 			|jumplist-stack|
 
 			*'joinspaces'* *'js'* *'nojoinspaces'* *'nojs'*
-'joinspaces' 'js'	boolean	(default on)
+'joinspaces' 'js'	boolean	(default off)
 			global
 	Insert two spaces after a '.', '?' and '!' with a join command.
 	Otherwise only one space is inserted.

runtime/doc/vim_diff.txt

@@ -45,6 +45,7 @@ the differences.
 - 'history' defaults to 10000 (the maximum)
 - 'hlsearch' is enabled
 - 'incsearch' is enabled
+- 'joinspaces' is disabled
 - 'langnoremap' is enabled
 - 'langremap' is disabled
 - 'laststatus' defaults to 2 (statusline is always shown)

src/nvim/options.lua

@@ -1288,7 +1288,7 @@ return {
       short_desc=N_("two spaces after a period with a join command"),
       type='bool', scope={'global'},
       varname='p_js',
-      defaults={if_true=true}
+      defaults={if_true=false}
     },
     {
       full_name='jumpoptions', abbreviation='jop',

src/nvim/testdir/setup.vim

@@ -12,6 +12,7 @@ set directory^=.
 set fillchars=vert:\|,fold:-
 set laststatus=1
 set listchars=eol:$
+set joinspaces
 set nohidden smarttab noautoindent noautoread complete-=i noruler noshowcmd
 set nrformats+=octal
 set shortmess-=F

src/nvim/testdir/test_join.vim

@@ -35,6 +35,7 @@ endfunc
 
 " Tests for setting the '[,'] marks when joining lines.
 func Test_join_marks()
+  set joinspaces
   enew
   call append(0, [
 	      \ "\t\tO sodales, ludite, vos qui",
@@ -53,6 +54,7 @@ func Test_join_marks()
   call assert_equal([0, 4, 11, 0], getpos("'["))
   call assert_equal([0, 4, 67, 0], getpos("']"))
   enew!
+  set nojoinspaces
 endfunc
 
 " Test for joining lines and marks in them

test/functional/helpers.lua

@@ -38,7 +38,7 @@ module.nvim_prog = (
 module.nvim_set = (
   'set shortmess+=IS background=light noswapfile noautoindent startofline'
   ..' laststatus=1 undodir=. directory=. viewdir=. backupdir=.'
-  ..' belloff= wildoptions-=pum noshowcmd noruler nomore redrawdebug=invalid')
+  ..' belloff= wildoptions-=pum joinspaces noshowcmd noruler nomore redrawdebug=invalid')
 module.nvim_argv = {
   module.nvim_prog, '-u', 'NONE', '-i', 'NONE',
   '--cmd', module.nvim_set,