--stdin::
When '--stdin' is specified, the command does not take
<tree-ish> arguments from the command line. Instead, it
- reads either one <commit> or a pair of <tree-ish>
+ reads either one <commit> or a list of <commit>
separated with a single space from its standard input.
+
When a single commit is given on one line of such input, it compares
the commit with its parents. The following flags further affects its
-behavior. This does not apply to the case where two <tree-ish>
-separated with a single space are given.
+behavior. The remaining commits, when given, are used as if they are
+parents of the first commit.
-m::
By default, "git-diff-tree --stdin" does not show