Material: Continued Material enahncements

Continues the work of the material subsystem improvements.

Several important items are included in this merge. In terms of new
capabilities, this merge adds List and MultiLineString as valid
property types, complete with editing dialogs. This will help with
backwards compatibility for external workbenches, such as Render.

Stability has been a big focus. New unit tests help to verify features
work as expected. Bugs have been fixed and crashes avoided.

Material cards have had a renaming to their tree structure. For
example, 'StandardMeterials' is redundant, so this was renamed to
'Standard'. The cards themselves are more compliant fully passing the
yamllint tests.

More soon.

src/Mod/Material/Gui/ListModel.cpp

@@ -0,0 +1,142 @@
+/***************************************************************************
+ *   Copyright (c) 2023 David Carter <dcarter@david.carter.ca>             *
+ *                                                                         *
+ *   This file is part of FreeCAD.                                         *
+ *                                                                         *
+ *   FreeCAD is free software: you can redistribute it and/or modify it    *
+ *   under the terms of the GNU Lesser General Public License as           *
+ *   published by the Free Software Foundation, either version 2.1 of the  *
+ *   License, or (at your option) any later version.                       *
+ *                                                                         *
+ *   FreeCAD is distributed in the hope that it will be useful, but        *
+ *   WITHOUT ANY WARRANTY; without even the implied warranty of            *
+ *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU      *
+ *   Lesser General Public License for more details.                       *
+ *                                                                         *
+ *   You should have received a copy of the GNU Lesser General Public      *
+ *   License along with FreeCAD. If not, see                               *
+ *   <https://www.gnu.org/licenses/>.                                      *
+ *                                                                         *
+ **************************************************************************/
+
+#include "PreCompiled.h"
+#ifndef _PreComp_
+#endif
+
+#include <QMetaType>
+
+#include <Base/Console.h>
+#include <Gui/MainWindow.h>
+#include <Gui/MetaTypes.h>
+
+#include <Mod/Material/App/Exceptions.h>
+#include <Mod/Material/App/Materials.h>
+
+#include "ListModel.h"
+
+
+using namespace MatGui;
+
+/* TRANSLATOR MatGui::ArrayModel */
+
+ListModel::ListModel()
+{}
+
+ListModel::ListModel(std::shared_ptr<Materials::MaterialProperty> property,
+                     QList<QVariant>& value,
+                     QObject* parent)
+    : QAbstractListModel(parent)
+    , _property(property)
+    , _valuePtr(&value)
+{}
+
+int ListModel::rowCount(const QModelIndex& parent) const
+{
+    if (parent.isValid()) {
+        return 0;  // No children
+    }
+
+    return _valuePtr->size() + 1;  // Will always have 1 empty row
+}
+
+bool ListModel::newRow(const QModelIndex& index) const
+{
+    return (index.row() == _valuePtr->size());
+}
+
+void ListModel::deleteRow(const QModelIndex& index)
+{
+    removeRows(index.row(), 1);
+    Q_EMIT dataChanged(index, index);
+}
+
+QVariant ListModel::data(const QModelIndex& index, int role) const
+{
+    if (role == Qt::DisplayRole) {
+        if (index.row() < _valuePtr->size()) {
+            return _valuePtr->at(index.row());
+        }
+    }
+
+    return QVariant();
+}
+
+QVariant ListModel::headerData(int section, Qt::Orientation orientation, int role) const
+{
+    // if (role == Qt::DisplayRole) {
+    //     if (orientation == Qt::Horizontal) {
+    //         const Materials::MaterialProperty& column = _property->getColumn(section);
+    //         return QVariant(column.getName());
+    //     }
+    //     else if (orientation == Qt::Vertical) {
+    //         // Vertical header
+    //         if (section == (rowCount() - 1)) {
+    //             return QVariant(QString::fromStdString("*"));
+    //         }
+    //         return QVariant(section + 1);
+    //     }
+    // }
+
+    return QAbstractListModel::headerData(section, orientation, role);
+}
+
+bool ListModel::setData(const QModelIndex& index, const QVariant& value, int role)
+{
+    Q_UNUSED(role);
+
+    if (index.row() == _valuePtr->size()) {
+        insertRows(index.row(), 1);
+    }
+    (*_valuePtr)[index.row()] = value;
+
+    Q_EMIT dataChanged(index, index);
+    return true;
+}
+
+Qt::ItemFlags ListModel::flags(const QModelIndex& index) const
+{
+    return (QAbstractListModel::flags(index) | Qt::ItemIsEditable);
+}
+
+
+// Resizing functions
+bool ListModel::insertRows(int row, int count, const QModelIndex& parent)
+{
+    beginInsertRows(parent, row, row + count - 1);
+
+    QVariant newRow = QString();
+    _valuePtr->insert(row, newRow);
+
+    endInsertRows();
+
+    return false;
+}
+
+bool ListModel::removeRows(int row, int count, const QModelIndex& parent)
+{
+    beginRemoveRows(parent, row, row + count - 1);
+
+    _valuePtr->removeAt(row);
+
+    return false;
+}