Fix several compiler warnings:

* Fix [-Wsign-compare]
* Fix [-Wc++20-designator]: designated initializers are a C++20 extension
* Fix [-Wunused-parameter]

src/Base/Tools.cpp

@@ -156,7 +156,7 @@ void Base::UniqueNameManager::addExactName(const std::string& name)
     baseNameAndDigitCountEntry.Add(digitsValue);
 }
 std::string Base::UniqueNameManager::makeUniqueName(const std::string& modelName,
-                                                    int minDigits) const
+                                                    std::size_t minDigits) const
 {
     std::string namePrefix;
     std::string nameSuffix;
@@ -169,7 +169,7 @@ std::string Base::UniqueNameManager::makeUniqueName(const std::string& modelName
     }
     // We don't care about the digit count of the suggested name, we always use at least the most
     // digits ever used before.
-    int digitCount = baseNameEntry->second.size() - 1;
+    std::size_t digitCount = baseNameEntry->second.size() - 1;
     uint digitsValue;
     if (digitCount < minDigits) {
         // Caller is asking for more digits than we have in any registered name.

src/Base/Tools.h

@@ -344,7 +344,7 @@ public:
     // name more than once. The effect if undetected is that the second registration will have no
     // effect
     void addExactName(const std::string& name);
-    std::string makeUniqueName(const std::string& modelName, int minDigits = 0) const;
+    std::string makeUniqueName(const std::string& modelName, std::size_t minDigits = 0) const;
 
     // Remove a registered name so it can be generated again.
     // Nothing happens if you try to remove a non-registered name.

src/Gui/View3DInventor.cpp

@@ -790,13 +790,13 @@ RayPickInfo View3DInventor::getObjInfoRay(Base::Vector3d* startvec, Base::Vector
     // near plane clipping is required to avoid false intersections
     float near = 0.1;
 
-    RayPickInfo ret = {.isValid = false,
-                       .point = Base::Vector3d(),
-                       .document = "",
-                       .object = "",
-                       .parentObject = std::nullopt,
-                       .component = std::nullopt,
-                       .subName = std::nullopt};
+    RayPickInfo ret = {false,
+                       Base::Vector3d(),
+                       "",
+                       "",
+                       std::nullopt,
+                       std::nullopt,
+                       std::nullopt};
     SoRayPickAction action(getViewer()->getSoRenderManager()->getViewportRegion());
     action.setRay(SbVec3f(vsx, vsy, vsz), SbVec3f(vdx, vdy, vdz), near);
     action.apply(getViewer()->getSoRenderManager()->getSceneGraph());

src/Mod/Spreadsheet/Gui/SheetTableView.cpp

@@ -119,6 +119,7 @@ SheetTableView::SheetTableView(QWidget* parent)
     setHorizontalScrollMode(QAbstractItemView::ScrollPerPixel);
 
     connect(verticalHeader(), &QWidget::customContextMenuRequested, [this](const QPoint& point) {
+        Q_UNUSED(point)
         QMenu menu {nullptr};
         const auto selection = selectionModel()->selectedRows();
         const auto& [min, max] = selectedMinMaxRows(selection);
@@ -145,6 +146,7 @@ SheetTableView::SheetTableView(QWidget* parent)
     });
 
     connect(horizontalHeader(), &QWidget::customContextMenuRequested, [this](const QPoint& point) {
+        Q_UNUSED(point)
         QMenu menu {nullptr};
         const auto selection = selectionModel()->selectedColumns();
         const auto& [min, max] = selectedMinMaxColumns(selection);