# note: Three frames arranged so the blended region is split in two.
# expect: reject
# anim: ok
# info: ok
# exercises: FindBlendRangeAtRow(), which is only reached when the previous
#   frame was disposed to background and the current one blends. Frame 3
#   sticks out on both sides of frame 2's rectangle, so rows that cross it
#   yield two ranges to blend and the strip between them is left alone;
#   rows above and below frame 2 take the disjoint branch and blend whole.
#   Neither frame 2 nor frame 3 is a key frame, which is what it takes to
#   get here at all.
alpha 1
frame
frame_duration 100
lossless
width 32
height 32
argb 0xff102030 x1024
frame
frame_x 4
frame_y 4
frame_duration 100
disposal_method 1
lossless
width 8
height 8
alpha_is_used 1
argb 0x60ff0000 x64
frame
frame_x 2
frame_y 2
frame_duration 100
lossless
width 24
height 24
alpha_is_used 1
argb 0x9000ff00 x576