Remove VisualNOS highlight group remnants

Nvim hasn't ever had X11 integration, so this has was never needed.

runtime/colors/darkblue.vim

@@ -17,7 +17,6 @@ let colors_name = "darkblue"
 hi Normal		guifg=#c0c0c0 guibg=#000040						ctermfg=gray ctermbg=black
 hi ErrorMsg		guifg=#ffffff guibg=#287eff						ctermfg=white ctermbg=lightblue
 hi Visual		guifg=#8080ff guibg=fg		gui=reverse				ctermfg=lightblue ctermbg=fg cterm=reverse
-hi VisualNOS	guifg=#8080ff guibg=fg		gui=reverse,underline	ctermfg=lightblue ctermbg=fg cterm=reverse,underline
 hi Todo			guifg=#d14a14 guibg=#1248d1						ctermfg=red	ctermbg=darkblue
 hi Search		guifg=#90fff0 guibg=#2050d0						ctermfg=white ctermbg=darkblue cterm=underline term=underline
 hi IncSearch	guifg=#b0ffff guibg=#2050d0							ctermfg=darkblue ctermbg=gray

runtime/colors/delek.vim

@@ -39,7 +39,6 @@ hi StatusLineNC	cterm=bold	   ctermbg=blue ctermfg=black  guibg=gold guifg=blue
 hi Title      ctermfg=DarkMagenta  gui=bold guifg=Magenta
 hi VertSplit  cterm=reverse	   gui=reverse
 hi Visual     ctermbg=NONE	   cterm=reverse gui=reverse guifg=Grey guibg=fg
-hi VisualNOS  cterm=underline,bold gui=underline,bold
 hi WarningMsg ctermfg=DarkRed	   guifg=Red
 hi WildMenu   ctermfg=Black	   ctermbg=Yellow    guibg=Yellow guifg=Black
 

runtime/colors/desert.vim

@@ -47,7 +47,6 @@ hi StatusLine	guibg=#c2bfa5 guifg=black gui=none
 hi StatusLineNC	guibg=#c2bfa5 guifg=grey50 gui=none
 hi Title	guifg=indianred
 hi Visual	gui=none guifg=khaki guibg=olivedrab
-"hi VisualNOS
 hi WarningMsg	guifg=salmon
 "hi WildMenu
 "hi Menu
@@ -83,7 +82,6 @@ hi StatusLineNC cterm=reverse
 hi VertSplit	cterm=reverse
 hi Title	ctermfg=5
 hi Visual	cterm=reverse
-hi VisualNOS	cterm=bold,underline
 hi WarningMsg	ctermfg=1
 hi WildMenu	ctermfg=0 ctermbg=3
 hi Folded	ctermfg=darkgrey ctermbg=NONE

runtime/colors/evening.vim

@@ -23,7 +23,6 @@ hi StatusLine term=reverse,bold cterm=reverse,bold gui=reverse,bold
 hi StatusLineNC term=reverse cterm=reverse gui=reverse
 hi VertSplit term=reverse cterm=reverse gui=reverse
 hi Visual term=reverse ctermbg=black guibg=grey60
-hi VisualNOS term=underline,bold cterm=underline,bold gui=underline,bold
 hi DiffText term=reverse cterm=bold ctermbg=Red gui=bold guibg=Red
 hi Cursor guibg=Green guifg=Black
 hi lCursor guibg=Cyan guifg=Black

runtime/colors/morning.vim

@@ -23,7 +23,6 @@ hi StatusLine term=reverse,bold cterm=reverse,bold gui=reverse,bold
 hi StatusLineNC term=reverse cterm=reverse gui=reverse
 hi VertSplit term=reverse cterm=reverse gui=reverse
 hi Visual term=reverse ctermbg=grey guibg=grey80
-hi VisualNOS term=underline,bold cterm=underline,bold gui=underline,bold
 hi DiffText term=reverse cterm=bold ctermbg=Red gui=bold guibg=Red
 hi Cursor guibg=Green guifg=NONE
 hi lCursor guibg=Cyan guifg=NONE

runtime/colors/peachpuff.vim

@@ -34,7 +34,6 @@ hi StatusLineNC term=reverse cterm=reverse gui=bold guifg=PeachPuff guibg=Gray45
 hi VertSplit term=reverse cterm=reverse gui=bold guifg=White guibg=Gray45
 hi Title term=bold ctermfg=5 gui=bold guifg=DeepPink3
 hi Visual term=reverse cterm=reverse gui=reverse guifg=Grey80 guibg=fg
-hi VisualNOS term=bold,underline cterm=bold,underline gui=bold,underline
 hi WarningMsg term=standout ctermfg=1 gui=bold guifg=Red
 hi WildMenu term=standout ctermfg=0 ctermbg=3 guifg=Black guibg=Yellow
 hi Folded term=standout ctermfg=4 ctermbg=7 guifg=Black guibg=#e3c1a5

runtime/colors/shine.vim

@@ -24,7 +24,6 @@ hi StatusLine term=reverse,bold cterm=reverse,bold gui=reverse,bold
 hi StatusLineNC term=reverse cterm=reverse gui=reverse
 hi VertSplit term=reverse cterm=reverse gui=reverse
 hi Visual term=reverse cterm=reverse gui=reverse guifg=Grey guibg=fg
-hi VisualNOS term=underline,bold cterm=underline,bold gui=underline,bold
 hi DiffText term=reverse cterm=bold ctermbg=Red gui=bold guibg=Red
 hi Cursor ctermbg=Green guibg=Green guifg=Black
 hi lCursor guibg=Cyan guifg=Black

runtime/colors/slate.vim

@@ -45,7 +45,6 @@ let colors_name = "slate"
 :hi Todo guifg=orangered guibg=yellow2
 :hi Directory ctermfg=darkcyan
 :hi ErrorMsg cterm=bold guifg=White guibg=Red cterm=bold ctermfg=7 ctermbg=1
-:hi VisualNOS cterm=bold,underline
 :hi WildMenu ctermfg=0 ctermbg=3
 :hi DiffAdd ctermbg=4
 :hi DiffChange ctermbg=5

runtime/doc/options.txt

@@ -3492,9 +3492,6 @@ A jump table for the options with a short description can be found at |Q_op|.
 	|hl-Title|	 t  Titles for output from ":set all", ":autocmd" etc.
 	|hl-VertSplit|	 c  column used to separate vertically split windows
 	|hl-Visual|	 v  Visual mode
-	|hl-VisualNOS|	 V  Visual mode when Vim does is "Not Owning the
-			    Selection" Only X11 Gui's |gui-x11| and
-			    |xterm-clipboard|.
 	|hl-WarningMsg|	 w  warning messages
 	|hl-WildMenu|	 W  wildcard matches displayed for 'wildmenu'
 	|hl-Folded|	 f  line used for closed folds

runtime/doc/syntax.txt

@@ -4836,8 +4836,7 @@ Title		titles for output from ":set all", ":autocmd" etc.
 							*hl-Visual*
 Visual		Visual mode selection
 							*hl-VisualNOS*
-VisualNOS	Visual mode selection when vim is "Not Owning the Selection".
-		Only X11 Gui's |gui-x11| and |xterm-clipboard| supports this.
+VisualNOS	Removed. |vim-differences| {Nvim}
 							*hl-WarningMsg*
 WarningMsg	warning messages
 							*hl-WildMenu*

runtime/doc/vim_diff.txt

@@ -131,6 +131,9 @@ MS-DOS support:
   'bioskey'
   'conskey'
 
+Highlight groups:
+  |hl-VisualNOS|
+
 Other options:
   'guipty'
   'macatsui'

src/nvim/option.c

@@ -366,7 +366,7 @@ typedef struct vimoption {
   "8:SpecialKey,~:EndOfBuffer,z:TermCursor,Z:TermCursorNC,@:NonText," \
   "d:Directory,e:ErrorMsg,i:IncSearch,l:Search,m:MoreMsg,M:ModeMsg,n:LineNr," \
   "N:CursorLineNr,r:Question,s:StatusLine,S:StatusLineNC,c:VertSplit,t:Title," \
-  "v:Visual,V:VisualNOS,w:WarningMsg,W:WildMenu,f:Folded,F:FoldColumn," \
+  "v:Visual,w:WarningMsg,W:WildMenu,f:Folded,F:FoldColumn," \
   "A:DiffAdd,C:DiffChange,D:DiffDelete,T:DiffText,>:SignColumn,-:Conceal," \
   "B:SpellBad,P:SpellCap,R:SpellRare,L:SpellLocal,+:Pmenu,=:PmenuSel," \
   "x:PmenuSbar,X:PmenuThumb,*:TabLine,#:TabLineSel,_:TabLineFill," \