implement shift + click for the TPA tree. Closes #476
implement shift + click for the TPA tree. Closes #476

unipept/unipept,unipept/unipept,unipept/unipept,bmesuere/uni-test,bmesuere/uni-test,bmesuere/uni-test,bmesuere/uni-test,unipept/unipept,bmesuere/uni-test,unipept/unipept