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but the current process will remain selected (so you can filter, choose and
then go back to unfiltered mode to see the children of that process).

Inspired by feedback at http://www.reddit.com/r/linux/comments/23wpc7/announcing_htop_103_with_new_features_bugfixes/ch1paos

Test by nesting 30 shells
Patch from ArchLinux. Closes #65.

For now rates won't be colored gray when zero; I'll think about that.

Cleanup the code to prevent this bug from happening again.