Handle returning a result from automatic up navigation from another

task.

When navigating up from a different task, if the current activity has
a result set only finish the current activity instead of trying
finishAffinity. Log this so that developers know why this behavior is
happening.

Bug 6465336

Change-Id: Ic7cec6f0c0d5861296091e2aea9344309f5fc600

Author: adamp

core/java/android/app/Activity.java

@@ -2713,7 +2713,16 @@ public boolean onNavigateUp() {
                 onCreateNavigateUpTaskStack(b);
                 onPrepareNavigateUpTaskStack(b);
                 b.startActivities();
-                finishAffinity();
+
+                // We can't finishAffinity if we have a result.
+                // Fall back and simply finish the current activity instead.
+                if (mResultCode != RESULT_CANCELED || mResultData != null) {
+                    // Tell the developer what's going on to avoid hair-pulling.
+                    Log.i(TAG, "onNavigateUp only finishing topmost activity to return a result");
+                    finish();
+                } else {
+                    finishAffinity();
+                }
             } else {
                 navigateUpTo(upIntent);
             }