protected virtual bool PreProcessWmKeyDown_ShiftLeft(ref Message m)
{
long pos = _hexBox._bytePos;
long sel = _hexBox._selectionLength;
if (pos + sel < 1)
return true;
if (pos + sel <= _bpiStart.Index)
{
if (pos == 0)
return true;
pos--;
sel++;
}
else
{
sel = Math.Max(0, sel - 1);
}
_hexBox.ScrollByteIntoView();
_hexBox.InternalSelect(pos, sel);
return true;
}