Sheet: modernize C++: return braced init list

src/Mod/Spreadsheet/App/PropertyColumnWidthsPyImp.cpp

@@ -33,7 +33,7 @@ using namespace Spreadsheet;
 // returns a string which represents the object e.g. when printed in python
 std::string PropertyColumnWidthsPy::representation() const
 {
-    return std::string("<PropertyColumnWidths object>");
+    return {"<PropertyColumnWidths object>"};
 }
 
 PyObject *PropertyColumnWidthsPy::PyMake(struct _typeobject *, PyObject *, PyObject *)  // Python wrapper

src/Mod/Spreadsheet/App/PropertyRowHeightsPyImp.cpp

@@ -33,7 +33,7 @@ using namespace Spreadsheet;
 // returns a string which represents the object e.g. when printed in python
 std::string PropertyRowHeightsPy::representation() const
 {
-    return std::string("<PropertyRowHeights object>");
+    return {"<PropertyRowHeights object>"};
 }
 
 PyObject *PropertyRowHeightsPy::PyMake(struct _typeobject *, PyObject *, PyObject *)  // Python wrapper

src/Mod/Spreadsheet/App/PropertySheetPyImp.cpp

@@ -33,7 +33,7 @@ using namespace Spreadsheet;
 // returns a string which represents the object e.g. when printed in python
 std::string PropertySheetPy::representation() const
 {
-    return std::string("<PropertySheet object>");
+    return {"<PropertySheet object>"};
 }
 
 PyObject *PropertySheetPy::PyMake(struct _typeobject *, PyObject *, PyObject *)  // Python wrapper

src/Mod/Spreadsheet/App/Sheet.cpp

@@ -1399,8 +1399,7 @@ std::string Sheet::getAddressFromAlias(const std::string &alias) const
 
     if (cell)
         return cell->getAddress().toString();
-    else
-        return std::string();
+    return {};
 }
 
 /**

src/Mod/Spreadsheet/App/SheetPyImp.cpp

@@ -40,7 +40,7 @@ using namespace App;
 // returns a string which represents the object e.g. when printed in python
 std::string SheetPy::representation() const
 {
-    return std::string("<Sheet object>");
+    return {"<Sheet object>"};
 }
 
 PyObject *SheetPy::PyMake(struct _typeobject *, PyObject *, PyObject *)  // Python wrapper

src/Mod/Spreadsheet/Gui/SheetModel.cpp

@@ -176,8 +176,7 @@ QVariant SheetModel::data(const QModelIndex& index, int role) const
 
         if (cell->getStringContent(str))
             return QVariant(QString::fromUtf8(str.c_str()));
-        else
-            return QVariant();
+        return {};
     }
 
     // Get display value as computed property
@@ -195,8 +194,7 @@ QVariant SheetModel::data(const QModelIndex& index, int role) const
             if (cell->getAlias(alias)) {
                 return QVariant::fromValue(aliasBgColor);
             }
-            else
-                return QVariant();
+            return {};
         }
     }
 
@@ -250,23 +248,23 @@ QVariant SheetModel::data(const QModelIndex& index, int role) const
             case Qt::DisplayRole:
                 if (cell->getExpression()) {
                     std::string str;
-                    if (cell->getStringContent(str))
-                        if (!str.empty() && str[0] == '=')
+                    if (cell->getStringContent(str)) {
+                        if (!str.empty() && str[0] == '=') {
                             // If this is a real computed value, indicate that a recompute is
                             // needed before we can display it
                             return QVariant(QLatin1String("#PENDING"));
-                        else
+                        }
+                        else {
                             // If it's just a simple value, display the new value, but still
                             // format it as a pending value to indicate to the user that
                             // a recompute is needed
                             return QVariant(QString::fromUtf8(str.c_str()));
-                    else
-                        return QVariant();
+                        }
+                    }
                 }
-                else
-                    return QVariant();
+                return {};
             default:
-                return QVariant();
+                return {};
         }
     }
     else if (prop->isDerivedFrom(App::PropertyString::getClassTypeId())) {
@@ -299,7 +297,7 @@ QVariant SheetModel::data(const QModelIndex& index, int role) const
                 return QVariant::fromValue(qtAlignment);
             }
             default:
-                return QVariant();
+                return {};
         }
     }
     else if (prop->isDerivedFrom(App::PropertyQuantity::getClassTypeId())) {
@@ -359,7 +357,7 @@ QVariant SheetModel::data(const QModelIndex& index, int role) const
                 return formatCellDisplay(v, cell);
             }
             default:
-                return QVariant();
+                return {};
         }
     }
     else if (prop->isDerivedFrom(App::PropertyFloat::getClassTypeId())
@@ -421,7 +419,7 @@ QVariant SheetModel::data(const QModelIndex& index, int role) const
                 return formatCellDisplay(v, cell);
             }
             default:
-                return QVariant();
+                return {};
         }
     }
     else if (prop->isDerivedFrom(App::PropertyPythonObject::getClassTypeId())) {
@@ -470,11 +468,11 @@ QVariant SheetModel::data(const QModelIndex& index, int role) const
                 return formatCellDisplay(v, cell);
             }
             default:
-                return QVariant();
+                return {};
         }
     }
 
-    return QVariant();
+    return {};
 }
 
 QVariant SheetModel::headerData(int section, Qt::Orientation orientation, int role) const
@@ -502,7 +500,7 @@ QVariant SheetModel::headerData(int section, Qt::Orientation orientation, int ro
             return QString::number(section + 1);
         }
     }
-    return QVariant();
+    return {};
 }
 
 void SheetModel::setCellData(QModelIndex index, QString str)

src/Mod/Spreadsheet/Gui/SpreadsheetDelegate.cpp

@@ -94,7 +94,7 @@ QSize SpreadsheetDelegate::sizeHint(const QStyleOptionViewItem & option, const Q
 {
     Q_UNUSED(option);
     Q_UNUSED(index);
-    return QSize();
+    return {};
 }
 
 static inline void drawBorder(QPainter *painter, const QStyleOptionViewItem &option,

src/Mod/Spreadsheet/Gui/ViewProviderSpreadsheetPyImp.cpp

@@ -32,7 +32,7 @@ using namespace SpreadsheetGui;
 // returns a string which represents the object e.g. when printed in python
 std::string ViewProviderSpreadsheetPy::representation() const
 {
-    return std::string("<ViewProviderSpreadsheet object>");
+    return {"<ViewProviderSpreadsheet object>"};
 }
 
 PyObject* ViewProviderSpreadsheetPy::getView(PyObject* args)