void RichTextBox::addText(const RichTextBox::TextItem::List& texts) {
    if(texts.empty())
        return;

    dwt::Point scrollPos;
    ::SendMessage(handle(), EM_GETSCROLLPOS, 0, reinterpret_cast<LPARAM>(&scrollPos));

    bool scroll = scrollIsAtEnd();
    if(!scroll)
        ::SendMessage(handle(), WM_SETREDRAW, FALSE, 0);

    std::pair<int, int> cr = getCaretPosRange();
    unsigned charsRemoved = 0;

    {
        size_t len = 0;
        std::for_each(texts.begin(), texts.end(), [&len](const TextItem& ti) { len += ti.text.size(); } );

        int multipler = 1;
        size_t limit = ::SendMessage(handle(), EM_GETLIMITTEXT, 0, 0);

        if(length() + len > limit) {
            if(scroll)
                ::SendMessage(handle(), WM_SETREDRAW, FALSE, 0);

            if(len >= limit) {
                charsRemoved = length();
            } else {
                while (charsRemoved < len)
                    charsRemoved = ::SendMessage(handle(), EM_LINEINDEX, sendMessage(EM_LINEFROMCHAR, multipler++ * limit / 10), 0);
            }

            scrollPos.y -= posFromChar(charsRemoved).y;
            ::SendMessage(handle(), EM_SETSEL, 0, charsRemoved);
            ::SendMessage(handle(), EM_REPLACESEL, static_cast<WPARAM>(TRUE), reinterpret_cast<LPARAM>(_T("")));

            if(scroll)
                ::SendMessage(handle(), WM_SETREDRAW, TRUE, 0);
        }
    }

    ::SendMessage(handle(), EM_SETSEL, -1, -1);
    SETTEXTEX config = { ST_SELECTION, CP_ACP };

    for(TextItem::IterC i = texts.begin(); i != texts.end(); ++i) {
        if(i->text.empty())
            continue; // nothing to do here

        if(i->check) {
            // do keywords here
//          continue;
        }

        string line = escapeUnicode(_T("{\\urtf1\n") + rtfEscape(Text::toT(Text::toDOS(i->text))) + _T("}\n"));

        ::SendMessage(handle(), EM_SETCHARFORMAT, SCF_SELECTION, reinterpret_cast<LPARAM>(&i->cf));
        ::SendMessage(handle(), EM_SETTEXTEX, reinterpret_cast<WPARAM>(&config), reinterpret_cast<LPARAM>(line.c_str()));
    }

    ::SendMessage(handle(), EM_SETSEL, cr.first-charsRemoved, cr.second-charsRemoved);

    if(scroll) {
        const std::pair<int, int> sel = getCaretPosRange();
        ::SendMessage(handle(), EM_SETSEL, length(), -1);
        ::SendMessage(handle(), EM_SCROLLCARET, 0, 0);
        ::SendMessage(handle(), EM_SETSEL, sel.first, sel.second);
        ::SendMessage(handle(), WM_VSCROLL, SB_BOTTOM, 0);
    } else {
        ::SendMessage(handle(), EM_SETSCROLLPOS, 0, reinterpret_cast<LPARAM>(&scrollPos));
    }

    if(!scroll)
        ::SendMessage(handle(), WM_SETREDRAW, TRUE, 0);

    redraw();
}