PiP: Divide up the magnetic percent by 2.

At max size, doing a brute percentage calculation using width / minWidth
ends up with a magnetic distance that's too big. Divide by 2 again to
make it more natural.

Bug: 190657668
Test: Pinch to max size, drag down - doesn't immediate snap to it
anymore

Change-Id: Ib5de742b753239a151686c1a85b27a6fe553a577

libs/WindowManager/Shell/src/com/android/wm/shell/pip/phone/PipResizeGestureHandler.java

@@ -536,8 +536,9 @@ public class PipResizeGestureHandler {
                 mPipTaskOrganizer.scheduleFinishResizePip(mLastResizeBounds,
                         PipAnimationController.TRANSITION_DIRECTION_USER_RESIZE, callback);
             }
+            final float magnetRadiusPercent = (float) mLastResizeBounds.width() / mMinSize.x / 2.f;
             mPipDismissTargetHandler
-                    .setMagneticFieldRadiusPercent((float) mLastResizeBounds.width() / mMinSize.x);
+                    .setMagneticFieldRadiusPercent(magnetRadiusPercent);
             mPipUiEventLogger.log(
                     PipUiEventLogger.PipUiEventEnum.PICTURE_IN_PICTURE_RESIZE);
         } else {