Under Fed rules . . .

A1 is laying the ball in when:

(a) before the ball hits anything, and it subsequently goes through;
(b) while the ball is in the basket, and it continues and goes through;
(c) after the ball is through the basket (cleared the net)

A2 slaps the backboard hard enough to merit a T for unsportsmanlike conduct.

What's the status of the bucket in each case? Nothing cancels the shot once it's left the shooter's hand, right?

For completeness, if, however, a T is assessed (on either team) while A(n) is in the act of shooting . . . sorry, I know this was discussed recently . . . I am weak . . .

I don't know what this means Jeff but a PC foul is the only foul that cancels a shot in flight. Count the basket.

What I mean is . . .
 

if a A1 is in the act of shooting (ball not yet released) AND there is a T on either A2 or B2 at that point, is the result the same as it would be if the fouls were common fouls, i.e., if the foul is on B2, the shot is permitted to go to conclusion, if the foul is on A2, no shot?

Re: What I mean is . . .
 

Yes. Go over the dead-ball "table" in rule 6 ("the ball becomes dead when ...") and read the exceptions closely. Notice the difference between fouls by A and fouls by B. Notice the difference between "fouls" and "player control fouls". Also notice the difference between the swinging elbows violation when committed by A and B.