Be forgiving with accidental horizontal scroll

An accidental horizontal touch, due to vertical fling on the -1 screen
could lead to imperceptible change in zoom, and send a frame to client
composition. This CL adds extra padding to overlay scroll amount, to
avoid these accidental gestures.

Bug: 211245940
Test: https://ui.perfetto.dev/#!/viewer?trace_id=3260c116-c578-6dad-e047-0a327b7d346c
Change-Id: Id05e482c79c1dcc2e1ba73baf8a4a4101797bbd2

quickstep/src/com/android/launcher3/statehandlers/DepthController.java

@@ -294,6 +294,11 @@ public class DepthController implements StateHandler<LauncherState>,
     }
 
     public void onOverlayScrollChanged(float progress) {
+        // Add some padding to the progress, such we don't change the depth on the last frames of
+        // the animation. It's possible that a user flinging the feed quickly would scroll
+        // horizontally by accident, causing the device to enter client composition unnecessarily.
+        progress = Math.min(progress * 1.1f, 1f);
+
         // Round out the progress to dedupe frequent, non-perceptable updates
         int progressI = (int) (progress * 256);
         float progressF = Utilities.boundToRange(progressI / 256f, 0f, 1f);