[Side Sheet] Fixed side sheet swipe calculations in RightSheetDelegate.

These changes fix a bug for coplanar predictive back, where a sheet hide was triggered every time a predictive back swipe was started on a right coplanar sheet, rather than allowing the predictive back swipe.

PiperOrigin-RevId: 527681485

lib/java/com/google/android/material/sidesheet/RightSheetDelegate.java

@@ -63,13 +63,13 @@ int getExpandedOffset() {
   boolean isReleasedCloseToOriginEdge(@NonNull View releasedChild) {
     // To be considered released close to the origin (right) edge, the released child's left must
     // be at least halfway to the origin (right) edge of the screen.
-    return releasedChild.getLeft() > (getHiddenOffset() - getExpandedOffset()) / 2;
+    return releasedChild.getLeft() > (getHiddenOffset() + getExpandedOffset()) / 2;
   }
 
   @Override
   boolean isSwipeSignificant(float xVelocity, float yVelocity) {
     return SheetUtils.isSwipeMostlyHorizontal(xVelocity, yVelocity)
-        && yVelocity > sheetBehavior.getSignificantVelocityThreshold();
+        && Math.abs(xVelocity) > sheetBehavior.getSignificantVelocityThreshold();
   }
 
   @Override