LayoutLib: downsize the SparseArray when possible.

    }

    private void gc() {

        // Log.e("SparseArray", "gc start with " + mSize);

        int n = mSize;

        int o = 0;

        int[] keys = mKeys;

        mGarbage = false;

        mSize = o;

        // Log.e("SparseArray", "gc end with " + mSize);

        int newSize = ArrayUtils.idealIntArraySize(mSize);

        if (newSize < mKeys.length) {

            int[] nkeys = new int[newSize];

            WeakReference<?>[] nvalues = new WeakReference[newSize];

            System.arraycopy(mKeys, 0, nkeys, 0, newSize);

            System.arraycopy(mValues, 0, nvalues, 0, newSize);

            mKeys = nkeys;

            mValues = nvalues;

        }

    }

    /**