Of course, he is not identified as a heretic until he is officially determined to be such.
No, that’s
not the determination that would be made (and, for that matter,
could not be made).
Rather, the determination would be made as to whether or not he was pope, which he would cease to be if he were a heretic. The distinction may seem subtle, but is quite real.
And, no, he would not be able to blithely go about exercising papal prerogatives during such a period. Pope after Pope have discovered over the centuries that the absolute monarchy isn’t as absolute as it looks from the outside.
If such a trial were actually to be happening, you could
count on massive feet dragging, rejection of credentials, and every bureaucratic delaying tactic known to man (and a few more known only to the vatican).
If such a situation arose, noone would be bound by interim actions if he’s a non-pope. SO it comes back to determining, which is more delay and . . .
If he were to purport to pronounce procedures, and the cardinals were to ignore these and find him non-pope, his, well, blatherings would bind them no more than anything you or I proclaimed.
I don’t necessarily follow the logic that only the cardinals can determine the papal chair is vacant.
It is the dominant speculation that it would be a function of the cardinals. If nothing else, they would be investigating the situation when it appeare3d that it might be time to exercise their duty.
even if that’s the case, a reigning pope still can set the rules for cardinals voting.
Only if he’s the pope. If they ignore him and vote their own way that he isn’t pope, he still isn’t, and his “changes” weren’t real.
Unanimous or majority rules?
Noone really knows . . . it would ultimately be up to them, it seems.