Merge "Prevent exception when quick switching between two split pairs" into udc-dev am: 26d5493e69 am: 71fe404fd1

Original change: https://googleplex-android-review.googlesource.com/c/platform/packages/apps/Launcher3/+/23792388

Change-Id: If3b1a1a4bef71e51c70d072f9f4c5c6a03ea78ad
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>
diff --git a/quickstep/src/com/android/quickstep/TaskViewUtils.java b/quickstep/src/com/android/quickstep/TaskViewUtils.java
index bfe52dd..c9bad38 100644
--- a/quickstep/src/com/android/quickstep/TaskViewUtils.java
+++ b/quickstep/src/com/android/quickstep/TaskViewUtils.java
@@ -473,16 +473,14 @@
                     throw new IllegalStateException(
                             "Expected task to be showing, but it is " + mode);
                 }
-                if (change.getParent() == null) {
-                    throw new IllegalStateException("Initiating multi-split launch but the split"
-                            + "root of " + taskId + " is already visible or has broken hierarchy.");
-                }
             }
             if (taskId == initialTaskId) {
-                splitRoot1 = transitionInfo.getChange(change.getParent());
+                splitRoot1 = change.getParent() == null ? change :
+                        transitionInfo.getChange(change.getParent());
             }
             if (taskId == secondTaskId) {
-                splitRoot2 = transitionInfo.getChange(change.getParent());
+                splitRoot2 = change.getParent() == null ? change :
+                        transitionInfo.getChange(change.getParent());
             }
         }