Support non-standard activity type on secondary display

Get a valid stack on display by also evaluating the
windowing mode and activity type.

Bug: 111363427
Test: atest CtsActivityManagerDeviceTestCases
Change-Id: I74a6ee5436b69056814062c975ce0233c54c8832
diff --git a/services/core/java/com/android/server/wm/DisplayContent.java b/services/core/java/com/android/server/wm/DisplayContent.java
index 0ca8e1a..4457be5 100644
--- a/services/core/java/com/android/server/wm/DisplayContent.java
+++ b/services/core/java/com/android/server/wm/DisplayContent.java
@@ -3351,11 +3351,16 @@
 
         private void addStackReferenceIfNeeded(TaskStack stack) {
             if (stack.isActivityTypeHome()) {
+                // TODO(b/111363427) Rollback to throws exceptions once we figure out how to
+                // properly deal with home type stack when external display removed
                 if (mHomeStack != null) {
-                    throw new IllegalArgumentException("addStackReferenceIfNeeded: home stack="
+                    // throw new IllegalArgumentException("addStackReferenceIfNeeded: home stack="
+                    //        + mHomeStack + " already exist on display=" + this + " stack=" + stack);
+                    Slog.e(TAG, "addStackReferenceIfNeeded: home stack="
                             + mHomeStack + " already exist on display=" + this + " stack=" + stack);
+                } else {
+                    mHomeStack = stack;
                 }
-                mHomeStack = stack;
             }
             final int windowingMode = stack.getWindowingMode();
             if (windowingMode == WINDOWING_MODE_PINNED) {