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git/branch: explain why we do the mkdir dance
git/branch: unrevert the fix to the cleanpath optimization.

The cleanpath optimization was fixed, and somehow the fix
got reverted. Bring it back.

--- a/branch

+++ b/branch

@@ -74,8 +74,11 @@

 	y=$nl^$dirtypaths

 	cleanpaths=`$nl{echo $"x$nl$"y | sort | uniq -u}

 }

+

+# creating the dirs with a single

+# batch mkdir was significantly faster.

 if(! ~ $#cleanpaths 0)

-	cleandirs=`$nl{echo $nl^$cleanpaths | sed 's@/[^/]+/?$@@' | uniq}

+	cleandirs=`$nl{for(p in $cleanpaths) basename -d $p | uniq -u}

 if(! ~ $#cleandirs 0){

 	mkdir -p $cleandirs

 	mkdir -p .git/index9/tracked/$cleandirs