grid scretch bugfix

                }

                // Render children into grid cells

                //

                // align-items:stretch on the grid only stretches this wrapper

                // cell div to the row height — it does not cascade into the

                // widget rendered inside the cell, which just sizes to its own

                // content, leaving the "stretch" vertical-align option with no

                // visible effect. When stretch is requested, turn the cell

                // into a flex column and grow its one child to fill it.

                std::string cellClass = "we-cell-" + getInstanceId();

                std::string stretchCSS;

                if (verticalAlign == "stretch") {

                    stretchCSS += "." + cellClass + " { display: flex; flex-direction: column; }";

                    stretchCSS += " ." + cellClass + " > * { flex: 1 1 auto; min-height: 0; }";

                }

                if (m_verticalAlign == "stretch") {

                    stretchCSS += " @media (max-width: 768px) { ." + cellClass + " { display: flex !important; flex-direction: column !important; } ." + cellClass + " > * { flex: 1 1 auto !important; min-height: 0 !important; } }";

                }

                if (!stretchCSS.empty()) {

                    libhtmlpp::HtmlElement stretchStyleTag("style");

                    stretchStyleTag.appendChild(libhtmlpp::TextElement(stretchCSS.c_str()));

                    el.appendChild(stretchStyleTag);

                }

                const EditPlugin *cur = child;

                while (cur) {

                    libhtmlpp::HtmlElement cell("div");

                    cell.setAttribute("style", "min-width: 0; box-sizing: border-box;");

                    cell.setAttribute("class", cellClass.c_str());

                    cur->Render(cell);

                    grid.appendChild(cell);

                    cur = cur->nextElement();