From ae0a0a84d1a1e5fcba0b18d473e1f31e11b7018e Mon Sep 17 00:00:00 2001
From: Dianne Hackborn <hackbod@google.com>
Date: Wed, 7 Dec 2011 14:03:01 -0800
Subject: [PATCH] Fix issue #5144065: Tap on Music icon from Home screen...

... a different app opens

In some cases when reparenting activities we could end up with a reply
chain that crosses task boundaries, so if an activity below that needs
to be reparented we pull that and the activities above it up into the
new task.

Change-Id: Ia4fa041ab7069e39dac162ddbf5b8e1de98675b9
---
 .../java/com/android/server/am/ActivityStack.java | 15 +++++++++++++--
 1 file changed, 13 insertions(+), 2 deletions(-)

diff --git a/services/java/com/android/server/am/ActivityStack.java b/services/java/com/android/server/am/ActivityStack.java
index b5edc0a656cb7..6c1195387f4e0 100644
--- a/services/java/com/android/server/am/ActivityStack.java
+++ b/services/java/com/android/server/am/ActivityStack.java
@@ -1932,8 +1932,9 @@ final class ActivityStack {
                     // should be left as-is.
                     replyChainEnd = -1;
                 }
-                
-            } else if (target.resultTo != null) {
+
+            } else if (target.resultTo != null && (below == null
+                    || below.task == target.task)) {
                 // If this activity is sending a reply to a previous
                 // activity, we can't do anything with it now until
                 // we reach the start of the reply chain.
@@ -1963,6 +1964,8 @@ final class ActivityStack {
                         replyChainEnd = targetI;
                     }
                     ActivityRecord p = null;
+                    if (DEBUG_TASKS) Slog.v(TAG, "Finishing task at index "
+                            + targetI + " to " + replyChainEnd);
                     for (int srcPos=targetI; srcPos<=replyChainEnd; srcPos++) {
                         p = mHistory.get(srcPos);
                         if (p.finishing) {
@@ -1981,6 +1984,8 @@ final class ActivityStack {
                     if (replyChainEnd < 0) {
                         replyChainEnd = targetI;
                     }
+                    if (DEBUG_TASKS) Slog.v(TAG, "Reparenting task at index "
+                            + targetI + " to " + replyChainEnd);
                     for (int srcPos=replyChainEnd; srcPos>=targetI; srcPos--) {
                         ActivityRecord p = mHistory.get(srcPos);
                         if (p.finishing) {
@@ -2002,6 +2007,7 @@ final class ActivityStack {
                         p.setTask(task, null, false);
                         mHistory.add(lastReparentPos, p);
                         if (DEBUG_TASKS) Slog.v(TAG, "Pulling activity " + p
+                                + " from " + srcPos + " to " + lastReparentPos
                                 + " in to resetting task " + task);
                         mService.mWindowManager.moveAppToken(lastReparentPos, p.appToken);
                         mService.mWindowManager.setAppGroupId(p.appToken, p.task.taskId);
@@ -2031,6 +2037,11 @@ final class ActivityStack {
                         }
                     }
                 }
+
+            } else if (below != null && below.task != target.task) {
+                // We hit the botton of a task; the reply chain can't
+                // pass through it.
+                replyChainEnd = -1;
             }
             
             target = below;