test: update tests to work with 'hidden'

src/nvim/testdir/test_autocmd.vim

@@ -998,6 +998,7 @@ func Test_bufunload_all()
     endfunc
     au BufUnload * call UnloadAllBufs()
     au VimLeave * call writefile(['Test Finished'], 'Xout')
+    set nohidden
     edit Xxx1
     split Xxx2
     q

src/nvim/testdir/test_command_count.vim

@@ -33,7 +33,7 @@ func Test_command_count_0()
   delcommand RangeBuffers
   delcommand RangeBuffersAll
 
-  set hidden&
+  set nohidden
   set swapfile&
 endfunc
 

src/nvim/testdir/test_diffmode.vim

@@ -540,7 +540,7 @@ func Test_diffopt_hiddenoff()
 
   bwipe!
   bwipe!
-  set hidden& diffopt&
+  set nohidden diffopt&
 endfunc
 
 func Test_diffoff_hidden()
@@ -577,7 +577,7 @@ func Test_diffoff_hidden()
 
   bwipe!
   bwipe!
-  set hidden& diffopt&
+  set nohidden diffopt&
 endfunc
 
 func Test_setting_cursor()

src/nvim/testdir/test_gf.vim

@@ -145,7 +145,7 @@ func Test_gf_visual()
 
   bwipe!
   call delete('Xtest_gf_visual')
-  set hidden&
+  set nohidden
 endfunc
 
 func Test_gf_error()

src/nvim/testdir/test_ins_complete.vim

@@ -95,7 +95,7 @@ func Test_ins_complete()
   call delete('Xtest11.one')
   call delete('Xtest11.two')
   call delete('Xtestdata')
-  set cpt& cot& def& tags& tagbsearch& hidden&
+  set cpt& cot& def& tags& tagbsearch& nohidden
   cd ..
   call delete('Xdir', 'rf')
 endfunc

src/nvim/testdir/test_join.vim

@@ -35,7 +35,6 @@ 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",
@@ -52,9 +51,8 @@ func Test_join_marks()
 
   /^This line/;'}-join
   call assert_equal([0, 4, 11, 0], getpos("'["))
-  call assert_equal([0, 4, 67, 0], getpos("']"))
+  call assert_equal([0, 4, 66, 0], getpos("']"))
   enew!
-  set nojoinspaces
 endfunc
 
 " Test for joining lines and marks in them

src/nvim/testdir/test_mksession.vim

@@ -307,7 +307,7 @@ func Test_mksession_buffer_count()
   call delete('Xbaz')
   call delete('Xtest_mks.out')
   %bwipe!
-  set hidden&
+  set nohidden
 endfunc
 
 if has('extra_search')

src/nvim/testdir/test_options.vim

@@ -539,7 +539,7 @@ func Test_copy_winopt()
   call assert_equal(4,&numberwidth)
   bw!
 
-  set hidden&
+  set nohidden
 endfunc
 
 func Test_shortmess_F()

src/nvim/testdir/test_tagjump.vim

@@ -170,7 +170,7 @@ func Test_tag_symbolic()
   call assert_equal('Xtest.c', expand('%:t'))
   call assert_equal(2, col('.'))
 
-  set hidden&
+  set nohidden
   set tags&
   enew!
   call delete('Xtags')

src/nvim/testdir/test_window_cmd.vim

@@ -608,7 +608,7 @@ func Test_window_prevwin()
   " reset
   q
   call delete('tmp.txt')
-  set hidden&vim autoread&vim
+  set nohidden autoread&vim
   delfunc Fun_RenewFile
 endfunc