gitk: fix the display of files when filtered by path

[git/dscho.git] / t / t4013 / diff.diff-tree_--root_-r_initial

$ git diff-tree --root -r initial
444ac553ac7612cc88969031b02b3767fb8a353a
:000000 100644 0000000000000000000000000000000000000000 35d242ba79ae89ac695e26b3d4c27a8e6f028f9e A      dir/sub
:000000 100644 0000000000000000000000000000000000000000 01e79c32a8c99c557f0757da7cb6d65b3414466d A      file0
:000000 100644 0000000000000000000000000000000000000000 01e79c32a8c99c557f0757da7cb6d65b3414466d A      file2
$