widget: Invalidate cursor on style change
widget: Invalidate cursor on style change

https://bugzilla.gnome.org/show_bug.cgi?id=762963

thestinger/vte-ng,thestinger/vte-ng,saitoha/vte-sixel,saitoha/vte-sixel,saitoha/vte-sixel,thestinger/vte-ng