Sketcher: Fix errors message when selecting circle seam point. (#25953)

(cherry picked from commit a49d106807)

src/Mod/Sketcher/App/SketchObject.cpp

@@ -11438,6 +11438,17 @@ Data::IndexedName SketchObject::checkSubName(const char *subname) const{
         int posId = static_cast<int>(PointPos::none);
         if ((iss >> sep >> posId) && sep == 'v') {
             int idx = getVertexIndexGeoPos(geoId, static_cast<PointPos>(posId));
+
+            // Outside edit-mode circles exposes the seam point but not the center, while in edit-mode we expose the center but not the seam.
+            // getVertexIndexGeoPos searching for a circle start point (g1v1 for example) (which happens outside of edit mode) will fail.
+            // see https://github.com/FreeCAD/FreeCAD/issues/25089
+            // The following fix works because circles have always 1 vertex, whether in or out of edit mode.
+            if (idx < 0 && (static_cast<PointPos>(posId) == PointPos::start || static_cast<PointPos>(posId) == PointPos::end)) {
+                if (geo->is<Part::GeomCircle>() || geo->is<Part::GeomEllipse>()) {
+                    idx = getVertexIndexGeoPos(geoId, PointPos::mid);
+                }
+            }
+
             if (idx < 0) {
                 FC_ERR("invalid subname " << subname);
                 return Data::IndexedName();