Merge branch 'sb/diff-color-move-more'

"git diff --color-moved" feature has further been tweaked.

* sb/diff-color-move-more:
  diff.c: offer config option to control ws handling in move detection
  diff.c: add white space mode to move detection that allows indent changes
  diff.c: factor advance_or_nullify out of mark_color_as_moved
  diff.c: decouple white space treatment from move detection algorithm
  diff.c: add a blocks mode for moved code detection
  diff.c: adjust hash function signature to match hashmap expectation
  diff.c: do not pass diff options as keydata to hashmap
  t4015: avoid git as a pipe input
  xdiff/xdiffi.c: remove unneeded function declarations
  xdiff/xdiff.h: remove unused flags

Author: gitster

Documentation/config.txt

@@ -1152,6 +1152,11 @@ diff.colorMoved::
 	true the default color mode will be used. When set to false,
 	moved lines are not colored.
 
+diff.colorMovedWS::
+	When moved lines are colored using e.g. the `diff.colorMoved` setting,
+	this option controls the `<mode>` how spaces are treated
+	for details of valid modes see '--color-moved-ws' in linkgit:git-diff[1].
+
 color.diff.<slot>::
 	Use customized color for diff colorization.  `<slot>` specifies
 	which part of the patch to use the specified color, and is one

Documentation/diff-options.txt

@@ -276,10 +276,14 @@ plain::
 	that are added somewhere else in the diff. This mode picks up any
 	moved line, but it is not very useful in a review to determine
 	if a block of code was moved without permutation.
-zebra::
+blocks::
 	Blocks of moved text of at least 20 alphanumeric characters
 	are detected greedily. The detected blocks are
-	painted using either the 'color.diff.{old,new}Moved' color or
+	painted using either the 'color.diff.{old,new}Moved' color.
+	Adjacent blocks cannot be told apart.
+zebra::
+	Blocks of moved text are detected as in 'blocks' mode. The blocks
+	are painted using either the 'color.diff.{old,new}Moved' color or
 	'color.diff.{old,new}MovedAlternative'. The change between
 	the two colors indicates that a new block was detected.
 dimmed_zebra::
@@ -288,6 +292,31 @@ dimmed_zebra::
 	blocks are considered interesting, the rest is uninteresting.
 --
 
+--color-moved-ws=<modes>::
+	This configures how white spaces are ignored when performing the
+	move detection for `--color-moved`.
+ifdef::git-diff[]
+	It can be set by the `diff.colorMovedWS` configuration setting.
+endif::git-diff[]
+	These modes can be given as a comma separated list:
++
+--
+ignore-space-at-eol::
+	Ignore changes in whitespace at EOL.
+ignore-space-change::
+	Ignore changes in amount of whitespace.  This ignores whitespace
+	at line end, and considers all other sequences of one or
+	more whitespace characters to be equivalent.
+ignore-all-space::
+	Ignore whitespace when comparing lines. This ignores differences
+	even if one line has whitespace where the other line has none.
+allow-indentation-change::
+	Initially ignore any white spaces in the move detection, then
+	group the moved code blocks only into a block if the change in
+	whitespace is the same per line. This is incompatible with the
+	other modes.
+--
+
 --word-diff[=<mode>]::
 	Show a word diff, using the <mode> to delimit changed words.
 	By default, words are delimited by whitespace; see