Merge "Fix caching IME status for split screen even when it is not activated" into sc-dev am: 5ded797ef4

Original change: https://googleplex-android-review.googlesource.com/c/platform/frameworks/base/+/15080852

Change-Id: Ia3da3da137688a57cbc23909c161af8d8cffe2d8

libs/WindowManager/Shell/src/com/android/wm/shell/legacysplitscreen/DividerView.java

@@ -408,7 +408,7 @@ public class DividerView extends FrameLayout implements OnTouchListener,
     }
 
     boolean isHidden() {
-        return mSurfaceHidden;
+        return getVisibility() != View.VISIBLE || mSurfaceHidden;
     }
 
     /** Starts dragging the divider bar. */