forked from PsychoticNinja/irssi
Decolor the vertical window split bar in stock `colorless` theme (cherry picked from commit 561619f23ca2db21616d13f2291f3d46d649987c)
Decolor the vertical window split bar in stock `colorless` theme (cherry picked from commit 561619f23ca2db21616d13f2291f3d46d649987c)