widget: Fix selection's padding adjustment
widget: Fix selection's padding adjustment

https://bugzilla.gnome.org/show_bug.cgi?id=722873

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