Prune commentary and stale Rust port notes

benches/velocity_reference.py

@@ -85,7 +85,6 @@ HORIZON_MILLISECONDS = 100.0
 ASSUME_POINTER_MOVE_STOPPED_MILLISECONDS = 40.0
 MIN_SAMPLE_SIZE_LSQ2 = 3
 
-# ViewConfiguration.getScaledMaximumFlingVelocity(), in dp/s.
 MAXIMUM_FLING_VELOCITY_DP_S = 8000.0
 # DefaultFlingBehavior.performFling's own threshold, in the units of the
 # positions fed to the tracker -- pixels per second here.
@@ -103,7 +102,6 @@ def poly_fit_least_squares(x, y, sample_count, degree):
     m = sample_count
     n = truncated_degree + 1
 
-    # a[i][h] = x[h]**i, pre-multiplied by the (always 1.0) weight.
     a = [[0.0] * m for _ in range(n)]
     for h in range(m):
         a[0][h] = 1.0
@@ -219,7 +217,6 @@ def average(samples):
     return (samples[-1][1] - samples[0][1]) / span
 
 
-# --- The three recorded sample sets the Rust tests assert on. ----------------
 
 # 1. `transcript-fixture/touch/flick-120hz.touch`, as `DragGesture` feeds it:
 #    the DOWN position, then one position per MOVE. The UP at t=20 adds no
@@ -243,19 +240,12 @@ ACCELERATING_FLICK = [(0, 0.0), (10, 2.0), (20, 6.0), (30, 14.0), (40, 30.0), (5
 #    (a) An old, fast burst outside the 100ms horizon, then a slow steady
 #        drag: the burst must not leak into the estimate.
 OLD_BURST_THEN_STEADY = [(0, 0.0)] + [(10 + i * 10, 1000.0 + i) for i in range(11)]
-#    (b) The finger stops for 48ms and then lifts. The gap exceeds
-#        AssumePointerMoveStopped, so the walk breaks after one sample and
-#        there is no fling -- what stops a "park it and let go" from
-#        flinging at whatever speed the finger arrived with.
 STOPPED_BEFORE_RELEASE = [(0, 0.0), (4, 40.0), (8, 90.0), (12, 150.0), (60, 152.0)]
 
-# 5. `sense.rs`'s own `drag_gesture_tests`: what `DragGesture` feeds for a
-#    press and two move frames, which is the fewest a fit can use.
 TWO_MOVE_FRAMES = [(0, 0.0), (8, 100.0), (16, 220.0)]
 #    ... and one move frame, which Compose cannot fit either.
 ONE_MOVE_FRAME = [(0, 0.0), (8, 100.0)]
 
-# The phone: 1080x2424 at content_scale 2.55.
 PHONE_DENSITY = 2.55