Prevent position topmost task to top

Home stack was reordered to bottom after user switched. So, we
were able to navigate through all tasks by back key.

Position topmost task to top doesn't seem necessary, but had
unintentionally moved its parent to top.

Bug: 148087585
Test: switch user and go back
Change-Id: If0230a7ef5a118b442bea72e7a35defe9d4dea75

1 files changed, 0 insertions, 4 deletions

diff --git a/services/core/java/com/android/server/wm/RootWindowContainer.java b/services/core/java/com/android/server/wm/RootWindowContainer.java
index 2196d899406d..e3d85c84b50c 100644
--- a/services/core/java/com/android/server/wm/RootWindowContainer.java
+++ b/services/core/java/com/android/server/wm/RootWindowContainer.java
@@ -2008,10 +2008,6 @@ class RootWindowContainer extends WindowContainer<DisplayContent>
             for (int stackNdx = display.getStackCount() - 1; stackNdx >= 0; --stackNdx) {
                 final ActivityStack stack = display.getStackAt(stackNdx);
                 stack.switchUser(userId);
-                Task task = stack.getTopMostTask();
-                if (task != null && task != stack) {
-                    stack.positionChildAtTop(task);
-                }
             }
         }