Remove space item

Currently you can add space items, but you cannot remove them?
I am working on an activity which has two fragments, each fragment would have different nav icons and one has more icons than the other. I can add icons when moving to the second frag, but cannot remove nav icons when moving back to the first fragment.

Start by tracing the existing API used to add navigation icons and reproduce the issue while switching between the two fragments. The work is done when icons can be removed as well as added, so returning to the first fragment shows only its navigation icons.

Written by the indexing model from the issue text.