Merge "Guard against starting a multi-select event without having an anchor." into arc-apps

package com.android.documentsui.selection;

import static com.android.documentsui.base.Shared.DEBUG;

import android.graphics.Point;

import android.support.annotation.VisibleForTesting;

import android.support.v7.widget.RecyclerView;

import android.util.Log;

import android.view.View;

import com.android.documentsui.DirectoryReloadLock;

 * the interception going if necessary.

 */

public final class GestureSelector {

    private final String TAG = "GestureSelector";

    private final SelectionManager mSelectionMgr;

    private final Runnable mDragScroller;

    // Explicitly kick off a gesture multi-select.

    public boolean start(InputEvent event) {

        //the anchor must already be set before a multi-select event can be started

        if (mLastStartedItemPos < 0) {

            if (DEBUG) Log.d(TAG, "Tried to start multi-select without setting an anchor.");

            return false;

        }

        if (mStarted) {

            return false;

        }