add a check for deleting the active display list
add a check for deleting the active display list

seandepagnier/glshim,lunixbochs/glshim,RobertoMalatesta/glshim,lunixbochs/glshim,seandepagnier/glshim,RobertoMalatesta/glshim,seandepagnier/glshim,lunixbochs/glshim,RobertoMalatesta/glshim,seandepagnier/glshim,lunixbochs/glshim,RobertoMalatesta/glshim