widget: Maintain selection when rewrapping, take 3
widget: Maintain selection when rewrapping, take 3

https://bugzilla.gnome.org/show_bug.cgi?id=722635#c9

thestinger/vte-ng,rvu95/vte,flaxandteal/gasket-vte,thestinger/vte-ng,jessevdk/vte,jessevdk/vte,pjm0616/vte,jessevdk/vte,rvu95/vte,thestinger/vte-ng,flaxandteal/gasket-vte,pjm0616/vte,saitoha/vte-sixel,flaxandteal/gasket-vte,rvu95/vte,saitoha/vte-sixel,rvu95/vte,jessevdk/vte,pjm0616/vte,flaxandteal/gasket-vte,saitoha/vte-sixel