Revert "Dont update thumbnails of freeform windows on focus change"

This reverts commit 17690ffcf7ed47b2719c65bb148190ddcdf4232c.

Can not reproduce the problem reported in the original bug that
required the reverted CL.

Bug: 23591449
Bug: 23562904
Change-Id: I8262cef52036816e9b3f422f6b75b1959a4da7cd

2 files changed, 2 insertions, 16 deletions

diff --git a/services/core/java/com/android/server/am/ActivityStack.java b/services/core/java/com/android/server/am/ActivityStack.java
index cdb00ef17823..b4a8381a8201 100644
--- a/services/core/java/com/android/server/am/ActivityStack.java
+++ b/services/core/java/com/android/server/am/ActivityStack.java
@@ -901,14 +901,8 @@ final class ActivityStack {
         prev.task.touchActiveTime();
         clearLaunchTime(prev);
         final ActivityRecord next = mStackSupervisor.topRunningActivityLocked();
-        // In freeform mode we only update the thumbnail when there is no thumbnail yet since every
-        // focus change will request a thumbnail to be taken.
-        // Note furthermore that since windows can change their content in freeform mode all the
-        // time a thumbnail is possibly constantly outdated.
-        if (mService.mHasRecents &&
-                (next == null || next.noDisplay || next.task != prev.task || uiSleeping) &&
-                (!prev.task.hasThumbnail() ||
-                        prev.task.stack.mStackId != FREEFORM_WORKSPACE_STACK_ID)) {
+        if (mService.mHasRecents
+                && (next == null || next.noDisplay || next.task != prev.task || uiSleeping)) {
             prev.updateThumbnailLocked(screenshotActivities(prev), null);
         }
         stopFullyDrawnTraceIfNeeded();
diff --git a/services/core/java/com/android/server/am/TaskRecord.java b/services/core/java/com/android/server/am/TaskRecord.java
index 77dbad4340ed..7dcda45a504b 100644
--- a/services/core/java/com/android/server/am/TaskRecord.java
+++ b/services/core/java/com/android/server/am/TaskRecord.java
@@ -478,14 +478,6 @@ final class TaskRecord {
     }
 
     /**
-     * Returns true when we have a thumbnail.
-     * @return Returns true if there is a thumbnail.
-     */
-    boolean hasThumbnail() {
-        return mLastThumbnail != null;
-    }
-
-    /**
      * Sets the last thumbnail.
      * @return whether the thumbnail was set
      */