Merge #9539 "options: make 'listchars' and 'fillchars' local to window"

runtime/doc/options.txt

@@ -3653,7 +3653,7 @@ A jump table for the options with a short description can be found at |Q_op|.
 						*'listchars'* *'lcs'*
 'listchars' 'lcs'	string	(default: "tab:> ,trail:-,nbsp:+"
 				 Vi default: "eol:$")
-			global
+			local to window
 	Strings to use in 'list' mode and for the |:list| command.  It is a
 	comma separated list of string settings.
 
@@ -3662,11 +3662,26 @@ A jump table for the options with a short description can be found at |Q_op|.
 			omitted, there is no extra character at the end of the
 			line.
 							*lcs-tab*
-	  tab:xy	Two characters to be used to show a tab.  The first
-			char is used once.  The second char is repeated to
-			fill the space that the tab normally occupies.
-			"tab:>-" will show a tab that takes four spaces as
-			">---".  When omitted, a tab is show as ^I.
+	  tab:xy[z]	Two or three characters to be used to show a tab.
+			The third character is optional.
+
+	  tab:xy	The 'x' is always used, then 'y' as many times as will
+			fit.  Thus "tab:>-" displays:
+				>
+				>-
+				>--
+				etc.
+
+	  tab:xyz	The 'z' is always used, then 'x' is prepended, and
+			then 'y' is used as many times as will fit.  Thus
+			"tab:<->" displays:
+				>
+				<>
+				<->
+				<-->
+				etc.
+
+			When "tab:" is omitted, a tab is shown as ^I.
 							*lcs-space*
 	  space:c	Character to show for a space.  When omitted, spaces
 			are left blank.

runtime/doc/vim_diff.txt

@@ -37,8 +37,8 @@ a complete and centralized reference of those differences.
 - 'display' defaults to "lastline,msgsep"
 - 'encoding' is UTF-8 (cf. 'fileencoding' for file-content encoding)
 - 'fillchars' defaults (in effect) to "vert:│,fold:·"
-- 'fsync' is disabled
 - 'formatoptions' defaults to "tcqj"
+- 'fsync' is disabled
 - 'history' defaults to 10000 (the maximum)
 - 'hlsearch' is set by default
 - 'incsearch' is set by default
@@ -184,9 +184,10 @@ Options:
   'cpoptions' flags: |cpo-_|
   'display' flag `msgsep` to minimize scrolling when showing messages
   'guicursor' works in the terminal
-  'fillchars' flags: `msgsep` (see 'display' above)
-	      and `eob` for |hl-EndOfBuffer| marker
+  'fillchars' local to window. flags: `msgsep` (see 'display' above) and `eob`
+              for |hl-EndOfBuffer| marker
   'inccommand' shows interactive results for |:substitute|-like commands
+  'listchars' local to window
   'scrollback'
   'statusline' supports unlimited alignment sections
   'tabline' %@Func@foo%X can call any function on mouse-click