after first plot you cannot switch between bg or fg

[chaosphere2112]

import vcs
x=vc.sinit()
x.plot([1,2,34,5,4,3,2,1],bg=True)  # Plots in background as expected
x.plot([1,2,3,4,5,4,3,2,1],bg=False)  # Still in background

Migrated from: CDAT/cdat#1597

[doutriaux1]

yes that makes sense, i think it's a user error really here.