feat(defaults): switchbuf=uselast #15394

runtime/doc/options.txt

@@ -6116,7 +6116,7 @@ A jump table for the options with a short description can be found at |Q_op|.
 	specify special kinds of buffers.   See |special-buffers|.
 
 						*'switchbuf'* *'swb'*
-'switchbuf' 'swb'	string	(default "")
+'switchbuf' 'swb'	string	(default "uselast")
 			global
 	This option controls the behavior when switching between buffers.
 	Possible values (comma separated list):

runtime/doc/vim_diff.txt

@@ -56,6 +56,7 @@ the differences.
 - 'sidescroll' defaults to 1
 - 'smarttab' is enabled
 - 'startofline' is disabled
+- 'switchbuf' defaults to "uselast"
 - 'tabpagemax' defaults to 50
 - 'tags' defaults to "./tags;,tags"
 - 'ttimeoutlen' defaults to 50

src/nvim/options.lua

@@ -2390,7 +2390,7 @@ return {
       type='string', list='onecomma', scope={'global'},
       deny_duplicates=true,
       varname='p_swb',
-      defaults={if_true={vi=""}}
+      defaults={if_true={vi="uselast"}}
     },
     {
       full_name='synmaxcol', abbreviation='smc',

src/nvim/testdir/setup.vim

@@ -21,6 +21,7 @@ set undodir^=.
 set wildoptions=
 set startofline
 set sessionoptions+=options
+set switchbuf=
 
 " Unmap Nvim default mappings.
 unmap Y

src/nvim/testdir/test_quickfix.vim

@@ -1911,7 +1911,7 @@ func Test_switchbuf()
   enew | only
   set switchbuf=useopen
   cexpr "Xqftestfile1:1:10"
-  call assert_equal('', &switchbuf)
+  call assert_equal('uselast', &switchbuf)
 
   call delete('Xqftestfile1')
   call delete('Xqftestfile2')