patch 8.1.1280: remarks about functionality not in Vi clutters the help

Problem:    Remarks about functionality not in Vi clutters the help.
Solution:   Move all info about what is new in Vim or already existed in Vi to
            vi_diff.txt.  Remove {not in Vi} remarks. (closes #4268) Add
            "noet" to the help files modeline.  Also include many other help
            file improvements.
diff --git a/runtime/doc/editing.txt b/runtime/doc/editing.txt
index 60ac959..4d01e49 100644
--- a/runtime/doc/editing.txt
+++ b/runtime/doc/editing.txt
@@ -1,4 +1,4 @@
-*editing.txt*   For Vim version 8.1.  Last change: 2018 Dec 16
+*editing.txt*   For Vim version 8.1.  Last change: 2019 May 05
 
 
 		  VIM REFERENCE MANUAL    by Bram Moolenaar
@@ -44,7 +44,7 @@
 :keepalt {cmd}		Execute {cmd} while keeping the current alternate file
 			name.  Note that commands invoked indirectly (e.g.,
 			with a function) may still set the alternate file
-			name.  {not in Vi}
+			name.
 
 All file names are remembered in the buffer list.  When you enter a file name,
 for editing (e.g., with ":e filename") or writing (e.g., with ":w filename"),
@@ -60,14 +60,13 @@
 			option is set), and the file status (readonly,
 			modified, read errors, new file).  See the 'shortmess'
 			option about how to make this message shorter.
-			{Vi does not include column number}
 
 :f[ile]!		like |:file|, but don't truncate the name even when
 			'shortmess' indicates this.
 
 {count}CTRL-G		Like CTRL-G, but prints the current file name with
 			full path.  If the count is higher than 1 the current
-			buffer number is also given.  {not in Vi}
+			buffer number is also given.
 
 					*g_CTRL-G* *word-count* *byte-count*
 g CTRL-G		Prints the current position of the cursor in five
@@ -80,7 +79,6 @@
 			column are shown, separated with a dash.
 			Also see the 'ruler' option and the |wordcount()|
 			function.
-			{not in Vi}
 
 							*v_g_CTRL-G*
 {Visual}g CTRL-G	Similar to "g CTRL-G", but Word, Character, Line, and
@@ -88,7 +86,6 @@
 			displayed.
 			In Blockwise mode, Column count is also shown.  (For
 			{Visual} see |Visual-mode|.)
-			{not in VI}
 
 							*:file_f*
 :f[ile][!] {name}	Sets the current file name to {name}.  The optional !
@@ -98,14 +95,12 @@
 			to hold the old name.
 							*:0file*
 :0f[ile][!]		Remove the name of the current buffer.  The optional !
-			avoids truncating the message, as with |:file|.  {not
-			in Vi}
+			avoids truncating the message, as with |:file|.
 
 :buffers
 :files
 :ls			List all the currently known file names.  See
-			'windows.txt' |:files| |:buffers| |:ls|.  {not in
-			Vi}
+			'windows.txt' |:files| |:buffers| |:ls|.
 
 Vim will remember the full path name of a file name that you enter.  In most
 cases when the file name is displayed only the name you typed is shown, but
@@ -244,19 +239,17 @@
 			If 'fileformats' is not empty, the first format given
 			will be used for the new buffer.  If 'fileformats' is
 			empty, the 'fileformat' of the current buffer is used.
-			{not in Vi}
 
 							*:ene!* *:enew!*
 :ene[w]!		Edit a new, unnamed buffer.  Discard any changes to
 			the current buffer.
 			Set 'fileformat' like |:enew|.
-			{not in Vi}
 
 							*:fin* *:find*
 :fin[d][!] [++opt] [+cmd] {file}
 			Find {file} in 'path' and then |:edit| it.
-			{not in Vi} {not available when the |+file_in_path|
-			feature was disabled at compile time}
+			{not available when the |+file_in_path| feature was
+			disabled at compile time}
 
 :{count}fin[d][!] [++opt] [+cmd] {file}
 			Just like ":find", but use the {count} match in
@@ -278,7 +271,7 @@
 :vie[w][!] [++opt] [+cmd] file
 			When used in Ex mode: Leave |Ex-mode|, go back to
 			Normal mode.  Otherwise same as |:edit|, but set
-			'readonly' option for this buffer.  {not in Vi}
+			'readonly' option for this buffer.
 
 							*CTRL-^* *CTRL-6*
 CTRL-^			Edit the alternate file.  Mostly the alternate file is
@@ -297,7 +290,6 @@
 			":e #[count]").  This is a quick way to switch between
 			files.
 			See |CTRL-^| above for further details.
-			{not in Vi}
 
 [count]]f						*]f* *[f*
 [count][f		Same as "gf".  Deprecated.
@@ -331,7 +323,6 @@
 			For Unix the '~' character is expanded, like in
 			"~user/file".  Environment variables are expanded too
 			|expand-env|.
-			{not in Vi}
 			{not available when the |+file_in_path| feature was
 			disabled at compile time}
 
@@ -341,7 +332,6 @@
 			Leading blanks are skipped, otherwise all blanks and
 			special characters are included in the file name.
 			(For {Visual} see |Visual-mode|.)
-			{not in VI}
 
 							*gF*
 [count]gF		Same as "gf", except if a number follows the file
@@ -637,7 +627,6 @@
 			still be added to the argument list, but won't be
 			edited. No check for duplicates is done.
 			Also see |++opt| and |+cmd|.
-			{not in Vi}
 
 :[count]arga[dd] {name} ..			*:arga* *:argadd* *E479*
 :[count]arga[dd]
@@ -659,7 +648,6 @@
 			There is no check for duplicates, it is possible to
 			add a file to the argument list twice.
 			The currently edited file is not changed.
-			{not in Vi}
 			Note: you can also use this method: >
 				:args ## x
 <			This will add the "x" item and sort the new list.
@@ -673,7 +661,6 @@
 			when it's deleted from the argument list.
 			Example: >
 				:argdel *.obj
-<			{not in Vi}
 
 :[range]argd[elete]	Delete the {range} files from the argument list.
 			Example: >
@@ -688,7 +675,6 @@
 <			Removes all the files from the arglist.
 			When the last number in the range is too high, up to
 			the last argument is deleted.
-			{not in Vi}
 
 							*:argu* *:argument*
 :[count]argu[ment] [count] [++opt] [+cmd]
@@ -697,14 +683,12 @@
 			when changes have been made and Vim does not want to
 			|abandon| the current buffer.
 			Also see |++opt| and |+cmd|.
-			{not in Vi}
 
 :[count]argu[ment]! [count] [++opt] [+cmd]
 			Edit file [count] in the argument list, discard any
 			changes to the current buffer.  When [count] is
 			omitted the current entry is used.
 			Also see |++opt| and |+cmd|.
-			{not in Vi}
 
 :[count]n[ext] [++opt] [+cmd]			*:n* *:ne* *:next* *E165* *E163*
 			Edit [count] next file.  This fails when changes have
@@ -727,7 +711,7 @@
 			Edit [count] previous file in argument list.  This
 			fails when changes have been made and Vim does not
 			want to |abandon| the current buffer.
-			Also see |++opt| and |+cmd|.  {Vi: no count or ++opt}.
+			Also see |++opt| and |+cmd|.
 
 :[count]N[ext]! [count] [++opt] [+cmd]
 			Edit [count] previous file in argument list.  Discard
@@ -748,44 +732,43 @@
 :rew[ind]! [++opt] [+cmd]
 			Start editing the first file in the argument list.
 			Discard any changes to the buffer.  Also see |++opt|
-			and |+cmd|. {Vi: no ++opt}
+			and |+cmd|.
 
 							*:fir* *:first*
 :fir[st][!] [++opt] [+cmd]
-			Other name for ":rewind". {not in Vi}
+			Other name for ":rewind".
 
 							*:la* *:last*
 :la[st] [++opt] [+cmd]
 			Start editing the last file in the argument list.
 			This fails when changes have been made and Vim does
 			not want to |abandon| the current buffer.
-			Also see |++opt| and |+cmd|.  {not in Vi}
+			Also see |++opt| and |+cmd|.
 
 :la[st]! [++opt] [+cmd]
 			Start editing the last file in the argument list.
 			Discard any changes to the buffer.  Also see |++opt|
-			and |+cmd|.  {not in Vi}
+			and |+cmd|.
 
 							*:wn* *:wnext*
 :[count]wn[ext] [++opt]
 			Write current file and start editing the [count]
-			next file.  Also see |++opt| and |+cmd|.  {not in Vi}
+			next file.  Also see |++opt| and |+cmd|.
 
 :[count]wn[ext] [++opt] {file}
 			Write current file to {file} and start editing the
 			[count] next file, unless {file} already exists and
 			the 'writeany' option is off.  Also see |++opt| and
-			|+cmd|.  {not in Vi}
+			|+cmd|.
 
 :[count]wn[ext]! [++opt] {file}
 			Write current file to {file} and start editing the
-			[count] next file.  Also see |++opt| and |+cmd|.  {not
-			in Vi}
+			[count] next file.  Also see |++opt| and |+cmd|.
 
 :[count]wN[ext][!] [++opt] [file]		*:wN* *:wNext*
 :[count]wp[revious][!] [++opt] [file]		*:wp* *:wprevious*
 			Same as :wnext, but go to previous file instead of
-			next.  {not in Vi}
+			next.
 
 The [count] in the commands above defaults to one.  For some commands it is
 possible to use two counts.  The last one (rightmost one) is used.
@@ -826,8 +809,6 @@
 
 LOCAL ARGUMENT LIST
 
-{not in Vi}
-
 							*:arglocal*
 :argl[ocal]		Make a local copy of the global argument list.
 			Doesn't start editing another file.
@@ -878,7 +859,6 @@
 			autocommand event is disabled by adding it to
 			'eventignore'.  This considerably speeds up editing
 			each file.
-			{not in Vi}
 			Also see |:windo|, |:tabdo|, |:bufdo|, |:cdo|, |:ldo|,
 			|:cfdo| and |:lfdo|
 
@@ -970,12 +950,11 @@
 			When 'filetype' is empty filetype detection is done
 			with the new name, before the file is written.
 			When the write was successful 'readonly' is reset.
-			{not in Vi}
 
 							*:up* *:update*
 :[range]up[date][!] [++opt] [>>] [file]
 			Like ":write", but only write when the buffer has been
-			modified.  {not in Vi}
+			modified.
 
 
 WRITING WITH MULTIPLE BUFFERS				*buffer-write*
@@ -983,11 +962,11 @@
 							*:wa* *:wall*
 :wa[ll]			Write all changed buffers.  Buffers without a file
 			name cause an error message.  Buffers which are
-			readonly are not written. {not in Vi}
+			readonly are not written.
 
 :wa[ll]!		Write all changed buffers, even the ones that are
 			readonly.  Buffers without a file name are not
-			written and cause an error message. {not in Vi}
+			written and cause an error message.
 
 
 Vim will warn you if you try to overwrite a file that has been changed
@@ -1118,7 +1097,7 @@
 
 :conf[irm] q[uit]	Quit, but give prompt when changes have been made, or
 			the last file in the argument list has not been
-			edited.  See |:confirm| and 'confirm'.  {not in Vi}
+			edited.  See |:confirm| and 'confirm'.
 
 :q[uit]!		Quit without writing, also when the current buffer has
 			changes.  The buffer is unloaded, also when it has
@@ -1131,7 +1110,7 @@
 
 :cq[uit]		Quit always, without writing, and return an error
 			code.  See |:cq|.  Used for Manx's QuickFix mode (see
-			|quickfix|).  {not in Vi}
+			|quickfix|).
 
 							*:wq*
 :wq [++opt]		Write the current file and quit.  Writing fails when
@@ -1169,7 +1148,7 @@
 
 							*ZQ*
 ZQ			Quit without checking for changes (same as ":q!").
-			{not in Vi}
+
 
 MULTIPLE WINDOWS AND BUFFERS				*window-exit*
 
@@ -1177,36 +1156,35 @@
 :qa[ll]		Exit Vim, unless there are some buffers which have been
 		changed.  (Use ":bmod" to go to the next modified buffer).
 		When 'autowriteall' is set all changed buffers will be
-		written, like |:wqall|. {not in Vi}
+		written, like |:wqall|.
 
 :conf[irm] qa[ll]
 		Exit Vim.  Bring up a prompt when some buffers have been
-		changed.  See |:confirm|. {not in Vi}
+		changed.  See |:confirm|.
 
-:qa[ll]!	Exit Vim.  Any changes to buffers are lost. {not in Vi}
+:qa[ll]!	Exit Vim.  Any changes to buffers are lost.
 		Also see |:cquit|, it does the same but exits with a non-zero
 		value.
 
 							*:quita* *:quitall*
-:quita[ll][!]	Same as ":qall". {not in Vi}
+:quita[ll][!]	Same as ":qall".
 
 :wqa[ll] [++opt]				*:wqa* *:wqall* *:xa* *:xall*
 :xa[ll]		Write all changed buffers and exit Vim.  If there are buffers
 		without a file name, which are readonly or which cannot be
-		written for another reason, Vim will not quit. {not in Vi}
+		written for another reason, Vim will not quit.
 
 :conf[irm] wqa[ll] [++opt]
 :conf[irm] xa[ll]
 		Write all changed buffers and exit Vim.  Bring up a prompt
 		when some buffers are readonly or cannot be written for
-		another reason.  See |:confirm|. {not in Vi}
+		another reason.  See |:confirm|.
 
 :wqa[ll]! [++opt]
 :xa[ll]!	Write all changed buffers, even the ones that are readonly,
 		and exit Vim.  If there are buffers without a file name or
 		which cannot be written for another reason, or there is a
 		terminal with a running job, Vim will not quit.
-		{not in Vi}
 
 ==============================================================================
 6. Dialogs						*edit-dialogs*
@@ -1317,10 +1295,12 @@
 			name.  On Unix systems: Change the current directory
 			to the home directory.  Use |:pwd| to print the
 			current directory on all systems.
+			On Unix systems: clear any window-local directory.
 
 :cd[!] {path}		Change the current directory to {path}.
 			If {path} is relative, it is searched for in the
 			directories listed in |'cdpath'|.
+			Clear any window-local directory.
 			Does not change the meaning of an already opened file,
 			because its full path name is remembered.  Files from
 			the |arglist| may change though!
@@ -1330,7 +1310,7 @@
 <
 							*:cd-* *E186*
 :cd[!] -		Change to the previous current directory (before the
-			previous ":cd {path}" command). {not in Vi}
+			previous ":cd {path}" command).
 
 							*:chd* *:chdir*
 :chd[ir][!] [path]	Same as |:cd|.
@@ -1341,20 +1321,18 @@
 			The current directory is not changed for windows in
 			other tabs and for windows in the current tab that
 			have their own window-local directory.
-			{not in Vi}
 
 							*:tch* *:tchdir*
-:tch[dir][!]		Same as |:tcd|. {not in Vi}
+:tch[dir][!]		Same as |:tcd|.
 
 							*:lc* *:lcd*
 :lc[d][!] {path}	Like |:cd|, but only set the current directory when
 			the cursor is in the current window.  The current
 			directory for other windows is not changed, switching
 			to another window will stop using {path}.
-			{not in Vi}
 
 							*:lch* *:lchdir*
-:lch[dir][!]		Same as |:lcd|. {not in Vi}
+:lch[dir][!]		Same as |:lcd|.
 
 							*:pw* *:pwd* *E187*
 :pw[d]			Print the current directory name.  {Vi: no pwd}
@@ -1416,8 +1394,7 @@
   file.  Otherwise both <CR> <NL> and <NL> are considered to end a line
   and when the file is written the <NL> will be replaced with <CR> <NL>.
 - <Nul> characters are shown on the screen as ^@.  You can enter them with
-  "CTRL-V CTRL-@" or "CTRL-V 000" {Vi cannot handle <Nul> characters in the
-  file}
+  "CTRL-V CTRL-@" or "CTRL-V 000"
 - To insert a <NL> character in the file split a line.  When writing the
   buffer to a file a <NL> will be written for the <EOL>.
 - Vim normally appends an <EOL> at the end of the file if there is none.