TortoiseMerge/TortoiseGitMerge can also be used to view and edit file 
differences.

This change allows configuring tortoisemerge not only as mergetool but as 
difftool as well.
---
 mergetools/tortoisemerge | 12 ++++++++++--
 1 file changed, 10 insertions(+), 2 deletions(-)

diff --git a/mergetools/tortoisemerge b/mergetools/tortoisemerge
index d7ab666a59a2c..d3dcec1407f2d 100644
--- a/mergetools/tortoisemerge
+++ b/mergetools/tortoisemerge
@@ -1,5 +1,13 @@
-can_diff () {
-       return 1
+diff_cmd () {
+       basename="$(basename "$merge_tool_path" .exe)"
+       if test "$basename" = "tortoisegitmerge"
+       then
+               "$merge_tool_path" \
+                       -mine "$REMOTE" -base "$LOCAL"
+       else
+               "$merge_tool_path" \
+                       -mine:"$REMOTE" -base:"$LOCAL"
+       fi
 }
 
 merge_cmd () {

--
https://github.com/git/git/pull/471

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