of the original file with the string in the 'patchmode' option
	appended.  This option should start with a dot.  Use a string like
	".orig" or ".org".  'backupdir' must not be empty for this to work
	(Detail: The backup file is renamed to the patchmode file after the
	new file has been successfully written, that's why it must be possible
	to write a backup file).  If there was no file to be backed up, an
	empty file is created.
	When the 'backupskip' pattern matches, a patchmode file is not made.
	Using 'patchmode' for compressed files appends the extension at the
	end (e.g., "file.gz.orig"), thus the resulting name isn't always
	recognized as a compressed file.
	Only normal file name characters can be used, `/\*?[|<>` are illegal.

				*'path'* *'pa'* *E343* *E345* *E347* *E854*
'path' 'pa'		string	(default ".,,")
			global or local to buffer |global-local|
	This is a list of directories which will be searched when using the
	|gf|, [f, ]f, ^Wf, |:find|, |:sfind|, |:tabfind| and other commands,
	provided that the file being searched for has a relative path (not
	starting with "/", "./" or "../").  The directories in the 'path'
	option may be relative or absolute.
	- Use commas to separate directory names: >vim
		set path=.,/usr/local/include,/usr/include
<	- Spaces can also be used to separate directory names.  To have a
	  space in a directory name, precede it with an extra backslash, and
	  escape the space: >vim
		set path=.,/dir/with\\\ space
<	- To include a comma in a directory name precede it with an extra
	  backslash: >vim
		set path=.,/dir/with\\,comma
<	- To search relative to the directory of the current file, use: >vim
		set path=.
<	- To search in the current directory use an empty string between two
	  commas: >vim
		set path=,,
<	- A directory name may end in a ':' or '/'.
	- Environment variables are expanded |:set_env|.
	- When using |netrw| URLs can be used.  For example, adding
	  "https://www.vim.org" will make ":find index.html" work.
	- Search upwards and downwards in a directory tree using "*", "**" and
	  ";".  See |file-searching| for info and syntax.
	- Careful with '\' characters, type two to get one in the option: >vim
		set path=.,c:\\include
<	  Or just use '/' instead: >vim
		set path=.,c:/include
<	Don't forget "." or files won't even be found in the same directory as
	the file!
	The maximum length is limited.  How much depends on the system, mostly
	it is something like 256 or 1024 characters.
	You can check if all the include files are found, using the value of
	'path', see |:checkpath|.
	The use of |:set+=| and |:set-=| is preferred when adding or removing
	directories from the list.  This avoids problems when a future version
	uses another default.  To remove the current directory use: >vim
		set path-=
<	To add the current directory use: >vim
		set path+=
<	To use an environment variable, you probably need to replace the
	separator.  Here is an example to append $INCL, in which directory
	names are separated with a semicolon: >vim
		let &path = &path .. "," .. substitute($INCL, ';', ',', 'g')
<	Replace the ';' with a ':' or whatever separator is used.  Note that
	this doesn't work when $INCL contains a comma or white space.

		*'preserveindent'* *'pi'* *'nopreserveindent'* *'nopi'*
'preserveindent' 'pi'	boolean	(default off)
			local to buffer
	When changing the indent of the current line, preserve as much of the
	indent structure as possible.  Normally the indent is replaced by a
	series of tabs followed by spaces as required (unless |'expandtab'| is
	enabled, in which case only spaces are used).  Enabling this option
	means the indent will preserve as many existing characters as possible
	for indenting, and only add additional tabs or spaces as required.
	'expandtab' does not apply to the preserved white space, a Tab remains
	a Tab.
	NOTE: When using ">>" multiple times the resulting indent is a mix of
	tabs and spaces.  You might not like this.
	Also see 'copyindent'.
	Use |:retab| to clean