Extending the grid migration logic to handle density changes

For hotseat migratino, we simply drop the items with least weight
If the workspace row/column decreases by 2 or more, we clear the whole workspace

Bug: 25958224
Change-Id: I7131b955023d185ed10955f593184b9238546dc8

1 files changed, 6 insertions, 4 deletions

diff --git a/src/com/android/launcher3/LauncherModel.java b/src/com/android/launcher3/LauncherModel.java
index fe0abc024..0eb1a90b0 100644
--- a/src/com/android/launcher3/LauncherModel.java
+++ b/src/com/android/launcher3/LauncherModel.java
@@ -57,7 +57,7 @@ import com.android.launcher3.compat.PackageInstallerCompat.PackageInstallInfo;
 import com.android.launcher3.compat.UserHandleCompat;
 import com.android.launcher3.compat.UserManagerCompat;
 import com.android.launcher3.config.ProviderConfig;
-import com.android.launcher3.model.MigrateFromRestoreTask;
+import com.android.launcher3.model.GridSizeMigrationTask;
 import com.android.launcher3.model.WidgetsModel;
 import com.android.launcher3.util.ComponentKey;
 import com.android.launcher3.util.CursorIconInfo;
@@ -1651,14 +1651,14 @@ public class LauncherModel extends BroadcastReceiver
             int countX = profile.numColumns;
             int countY = profile.numRows;
 
-            if (MigrateFromRestoreTask.ENABLED && MigrateFromRestoreTask.shouldRunTask(mContext)) {
+            if (GridSizeMigrationTask.ENABLED && GridSizeMigrationTask.shouldRunTask(mContext)) {
                 long migrationStartTime = System.currentTimeMillis();
                 Log.v(TAG, "Starting workspace migration after restore");
                 try {
-                    MigrateFromRestoreTask task = new MigrateFromRestoreTask(mContext);
+                    GridSizeMigrationTask task = new GridSizeMigrationTask(mContext);
                     // Clear the flags before starting the task, so that we do not run the task
                     // again, in case there was an uncaught error.
-                    MigrateFromRestoreTask.clearFlags(mContext);
+                    GridSizeMigrationTask.clearFlags(mContext);
                     task.execute();
                 } catch (Exception e) {
                     Log.e(TAG, "Error during grid migration", e);
@@ -1668,6 +1668,8 @@ public class LauncherModel extends BroadcastReceiver
                 }
                 Log.v(TAG, "Workspace migration completed in "
                         + (System.currentTimeMillis() - migrationStartTime));
+
+                GridSizeMigrationTask.saveCurrentConfig(mContext);
             }
 
             if ((mFlags & LOADER_FLAG_CLEAR_WORKSPACE) != 0) {