Thank you for a suggestion. While using new libs might be an advantage, libvte-2.91 uses GTK+ 3.0, while until now lxterminal package was using GTK+ 2.0 (as well as rest of LXDE components). Switch to GTK+ 3.0 is not much desirable since LXDE is positioned as a lightweight environment but GTK+ 3.0 uses much more resources and has more bugs, some of which are not easy to workaround. Overall, users are negative on switching over to GTK+ 3.0 after some experience. And even if other applications aren't taken into consideration (I mean mostly style difference), use just one application with GTK+ 3.0 while other ones are GTK+ 2.0 may be a waste (as both GTK+ 2.0 and GTK+ 3.0 will be loaded at the same time).