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git/diff: show each file once (thanks Igor Boehm)

git/diff listed all files changed in tree, as well
as any files changed compared to the branch being
diffed against; this could lead to duplicates in
the list of changed files.

This change sorts and uniqs them, which both gives
a stable order and removes duplicates.

--- a/diff

+++ b/diff

@@ -9,18 +9,24 @@

 if(~ $#commit 0)

 	commit=HEAD

+

 files=()

 if(! ~ $#* 0)

 	files=`{cleanname $gitrel/$*}

+

 branch=`{git/query -p $commit}

 if(~ $summarize 1){

 	git/walk -fMAR $files

 	exit

 }

-dirty=`$nl{git/walk -c -fRMA $files}

-if(! ~ $commit HEAD)

-	dirty=($dirty `$nl{git/query -c $commit HEAD | subst '^..'})

-for(f in $dirty){

+

+fn lsdirty {

+	git/walk -c -fRMA $files

+	if(! ~ $commit HEAD)

+		git/query -c $commit HEAD | subst '^..'

+}

+

+for(f in `$nl{lsdirty | sort | uniq}){

 	orig=$branch/tree/$f

 	if(! test -f $orig)

 		orig=/dev/null