Fix layout been truncated after activated split screen

Stop cropping root surfaces when dismissing split screen, so the next
time entering split screen won't apply remaining crop setup
unexpectedly.

Fix: 202368189
Fix: 202358094
Test: atest WMShellUnitTests
Change-Id: Idf079b6cb04f1ced1d7cdf166fe54309dd64f163

libs/WindowManager/Shell/src/com/android/wm/shell/splitscreen/StageCoordinator.java

@@ -515,6 +515,9 @@ class StageCoordinator implements SplitLayout.SplitLayoutHandler,
         mSideStage.removeAllTasks(wct, childrenToTop == mSideStage);
         mMainStage.deactivate(wct, childrenToTop == mMainStage);
         mTaskOrganizer.applyTransaction(wct);
+        mSyncQueue.runInSync(t -> t
+                .setWindowCrop(mMainStage.mRootLeash, null)
+                .setWindowCrop(mSideStage.mRootLeash, null));
         // Hide divider and reset its position.
         setDividerVisibility(false);
         mSplitLayout.resetDividerPosition();