Export only drilled-down map

Currently if you drill-down a part of a map and export the map to Excel the whole map is exported (not only the drilled-down part though the file name is set per default to the drilled-down root map item).
I propose to export only the drilled-down part of the mind map.

Update: Obviously this is a bug anyway since it works as proposed if you export a drilled-down map to Project.