U++

In my opinion we should remove following part from the RichTextView::LeftDouble(Point p, dword keyflags):

while(cursor + 1 < text.GetLength() && text[cursor] == ' ')
    cursor++;

, because above code contributes to marking white spaces.

The final form of the function is as follows:

void RichTextView::LeftDouble(Point p, dword keyflags)
{
    int pos = GetPointPos(p);
    if(IsLeNum(text[pos])) {
        anchor = pos;
        while(anchor > 0 && IsLeNum(text[anchor - 1]))
            anchor--;
        cursor = pos;
        while(cursor + 1 < text.GetLength() && IsLeNum(text[cursor]))
            cursor++;
        RefreshSel();
        SetFocus();
    }
}

Moreover, I enclose improved source file.