Merge "Ensure only single pip dismiss magnetized target exists" into sc-v2-dev am: f92999a5e1

Original change: https://googleplex-android-review.googlesource.com/c/platform/frameworks/base/+/16602749

Change-Id: Ibe881d27475564731817bd7b868118e6333d9614

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

@@ -140,6 +140,7 @@ public class PipDismissTargetHandler implements ViewTreeObserver.OnPreDrawListen
         });
 
         mMagnetizedPip = mMotionHelper.getMagnetizedPip();
+        mMagnetizedPip.clearAllTargets();
         mMagneticTarget = mMagnetizedPip.addTarget(mTargetView, 0);
         updateMagneticTargetSize();