BumpOffset
fLines->BumpOffset(length, _LineAt(offset) + 1);
fStyles->BumpOffset(length, fStyles->OffsetToRun(offset - 1) + 1);
fLines->BumpOffset(length, _LineAt(offset) + 1);
fStyles->BumpOffset(length, fStyles->OffsetToRun(offset - 1) + 1);
BumpOffset(fromOffset - toOffset, fromLine + 1);
void BumpOffset(int32 delta, int32 index);
fStyleRunDesc.BumpOffset(fromOffset - toOffset, fromIndex + 1);
fStyleRunDesc.BumpOffset(delta, index);
void BumpOffset(int32 delta, int32 index);
void BumpOffset(int32 delta, int32 index);