Update swingx from 1.6.1 to 1.6.4 (#2356)
Update swingx from 1.6.1 to 1.6.4 (#2356)


JabRef/jabref,zellerdev/jabref,Mr-DLib/jabref,Siedlerchr/jabref,Siedlerchr/jabref,bartsch-dev/jabref,bartsch-dev/jabref,grimes2/jabref,sauliusg/jabref,mredaelli/jabref,oscargus/jabref,mredaelli/jabref,bartsch-dev/jabref,oscargus/jabref,jhshinn/jabref,sauliusg/jabref,oscargus/jabref,mredaelli/jabref,jhshinn/jabref,oscargus/jabref,Siedlerchr/jabref,sauliusg/jabref,Mr-DLib/jabref,Siedlerchr/jabref,grimes2/jabref,shitikanth/jabref,shitikanth/jabref,bartsch-dev/jabref,zellerdev/jabref,grimes2/jabref,zellerdev/jabref,jhshinn/jabref,jhshinn/jabref,grimes2/jabref,tobiasdiez/jabref,Mr-DLib/jabref,JabRef/jabref,shitikanth/jabref,JabRef/jabref,Mr-DLib/jabref,jhshinn/jabref,bartsch-dev/jabref,tobiasdiez/jabref,zellerdev/jabref,grimes2/jabref,zellerdev/jabref,oscargus/jabref,sauliusg/jabref,mredaelli/jabref,Mr-DLib/jabref,tobiasdiez/jabref,shitikanth/jabref,JabRef/jabref,mredaelli/jabref,tobiasdiez/jabref,shitikanth/jabref