Hello.

I was trying to sequence a series of non-looping sprite animations and ran into this issue where nesting play calls does not work.

  sprite.play animation: jump do  # block1
    sprite.play animation: fall do   # block2
      sprite:play animation: idle 
    end
  end

Expected behaviour

The sprite should jump (6 frame animation), then fall (another 6 frame animation), and then idle (looping animation).

Actual behaviour

The sprite jumps, falls, but never idles, since "block1" gets called, but "block2" never does.

Root cause

The root cause is the order of these lines:

Possible fix

Re-ordering them and using a local variable (as follows, for example) should fix the problem:

            kept_done_proc = @done_proc
            @done_proc = nil
            if kept_done_proc then kept_done_proc.call end