Do this special case search only when the array is large enough.

Otherwise the normal linear search should be sufficient.  Eventually
we need to use a better algorithm here than this special case handling...
diff --git a/editeng/source/editeng/editdoc.cxx b/editeng/source/editeng/editdoc.cxx
index f797d24..c791aa2 100644
--- a/editeng/source/editeng/editdoc.cxx
+++ b/editeng/source/editeng/editdoc.cxx
@@ -688,7 +688,7 @@ size_t FastGetPos(const _Array& rArray, const _Val* p, size_t& rLastPos)
    // Through certain filter code-paths we do a lot of appends, which in
    // turn call GetPos - creating some N^2 nightmares. If we have a
    // non-trivially large list, do a few checks from the end first.
    if (rLastPos > 16)
    if (rLastPos > 16 && nArrayLen > 16)
    {
        size_t nEnd;
        if (rLastPos > nArrayLen - 2)
@@ -698,7 +698,7 @@ size_t FastGetPos(const _Array& rArray, const _Val* p, size_t& rLastPos)

        for (size_t nIdx = rLastPos - 2; nIdx < nEnd; ++nIdx)
        {
            if (&rArray[nIdx] == p)
            if (&rArray.at(nIdx) == p)
            {
                rLastPos = nIdx;
                return nIdx;
@@ -707,7 +707,7 @@ size_t FastGetPos(const _Array& rArray, const _Val* p, size_t& rLastPos)
    }
    // The world's lamest linear search from svarray ...
    for (size_t nIdx = 0; nIdx < nArrayLen; ++nIdx)
        if (&rArray[nIdx] == p)
        if (&rArray.at(nIdx) == p)
            return rLastPos = nIdx;

    // 0xFFFF is used to signify "not found" condition. We need to change this.