{not available when compiled without the |+diff| feature} Option settings for diff mode. It can consist of the following items. All are optional. Items must be separated by a comma.

filler		Show filler lines, to keep the text
		synchronized with a window that has inserted
		lines at the same position.  Mostly useful
		when windows are side-by-side and 'scrollbind'
		is set.

context:{n}	Use a context of {n} lines between a change
		and a fold that contains unchanged lines.
		When omitted a context of six lines is used.
		When using zero the context is actually one,
		since folds require a line in between, also
		for a deleted line.
		See |fold-diff|.

iblank		Ignore changes where lines are all blank.  Adds
		the "-B" flag to the "diff" command if
		'diffexpr' is empty.  Check the documentation
		of the "diff" command for what this does
		exactly.
		NOTE: the diff windows will get out of sync,
		because no differences between blank lines are
		taken into account.

icase		Ignore changes in case of text.  "a" and "A"
		are considered the same.  Adds the "-i" flag
		to the "diff" command if 'diffexpr' is empty.

iwhite		Ignore changes in amount of white space.  Adds
		the "-b" flag to the "diff" command if
		'diffexpr' is empty.  Check the documentation
		of the "diff" command for what this does
		exactly.  It should ignore adding trailing
		white space, but not leading white space.

iwhiteall	Ignore all white space changes.  Adds
		the "-w" flag to the "diff" command if
		'diffexpr' is empty.  Check the documentation
		of the "diff" command for what this does
		exactly.

iwhiteeol	Ignore white space changes at end of line.
		Adds the "-Z" flag to the "diff" command if
		'diffexpr' is empty.  Check the documentation
		of the "diff" command for what this does
		exactly.

horizontal	Start diff mode with horizontal splits (unless
		explicitly specified otherwise).

vertical	Start diff mode with vertical splits (unless
		explicitly specified otherwise).

closeoff	When a window is closed where 'diff' is set
		and there is only one window remaining in the
		same tab page with 'diff' set, execute
		`:diffoff` in that window.  This undoes a
		`:diffsplit` command.

hiddenoff	Do not use diff mode for a buffer when it
		becomes hidden.

foldcolumn:{n}	Set the 'foldcolumn' option to {n} when
		starting diff mode.  Without this 2 is used.

followwrap	Follow the 'wrap' option and leave as it is.

internal	Use the internal diff library.  This is
		ignored when 'diffexpr' is set.
		When running out of memory when writing a
		buffer this item will be ignored for diffs
		involving that buffer.  Set the 'verbose'
		option to see when this happens.

indent-heuristic
		Use the indent heuristic for the internal
		diff library.

            algorithm:{text} Use the specified diff algorithm with the
		internal diff engine. Currently supported
		algorithms are:
		myers      the default algorithm
		minimal    spend extra time to generate the
			   smallest possible diff
		patience   patience diff algorithm
		histogram  histogram diff algorithm

Examples: > :set diffopt=internal,filler,context:4 :set diffopt= :set diffopt=internal,filler,foldcolumn:3 :set diffopt-=internal " do NOT use the internal diff parser <