[client] Forbid some invalid history transitions
It shouldn't be possible to move from the "create transaction" page, or the "budget" page, to the same page but for a non-account view.
You don't pay for Framagit, because it is funded by donations to Framasoft. Our not-for-profit needs any support you can afford: support.framasoft.org.
Framagit est gratuit car il est financé par les dons à Framasoft. Notre association a besoin de votre soutien sur soutenir.framasoft.org.
It shouldn't be possible to move from the "create transaction" page, or the "budget" page, to the same page but for a non-account view.