regIOobject: Added a move constructor

to resolve an issue with the unexpected registration of DimensionedFields
constructed from an unregistered temporary field.

src/OpenFOAM/db/regIOobject/regIOobject.C

@@ -2,7 +2,7 @@
   =========                 |
   \\      /  F ield         | OpenFOAM: The Open Source CFD Toolbox
    \\    /   O peration     | Website:  https://openfoam.org
-    \\  /    A nd           | Copyright (C) 2011-2021 OpenFOAM Foundation
+    \\  /    A nd           | Copyright (C) 2011-2022 OpenFOAM Foundation
      \\/     M anipulation  |
 -------------------------------------------------------------------------------
 License
@@ -71,6 +71,22 @@ Foam::regIOobject::regIOobject(const regIOobject& rio)
 }
 
 
+Foam::regIOobject::regIOobject(const regIOobject&& rio)
+:
+    IOobject(rio),
+    registered_(false),
+    ownedByRegistry_(false),
+    watchIndices_(),
+    eventNo_(db().getEvent())
+{
+    if (rio.registered_)
+    {
+        const_cast<regIOobject&>(rio).checkOut();
+        checkIn();
+    }
+}
+
+
 Foam::regIOobject::regIOobject(const regIOobject& rio, bool registerCopy)
 :
     IOobject(rio),

src/OpenFOAM/db/regIOobject/regIOobject.H

@@ -111,6 +111,10 @@ public:
         //- Copy constructor
         regIOobject(const regIOobject&);
 
+        //- Move constructor
+        //  Registers copy if the object is registered
+        regIOobject(const regIOobject&&);
+
         //- Copy constructor, transferring registry registration to copy
         //  if registerCopy is true
         regIOobject(const regIOobject&, bool registerCopy);

src/OpenFOAM/fields/DimensionedFields/DimensionedField/DimensionedField.C

@@ -135,7 +135,7 @@ DimensionedField<Type, GeoMesh>::DimensionedField
     bool reuse
 )
 :
-    regIOobject(df, reuse),
+    regIOobject(df, reuse && df.registered()),
     Field<Type>(df, reuse),
     mesh_(df.mesh_),
     dimensions_(df.dimensions_)
@@ -148,7 +148,7 @@ DimensionedField<Type, GeoMesh>::DimensionedField
     DimensionedField<Type, GeoMesh>&& df
 )
 :
-    regIOobject(move(df), true),
+    regIOobject(move(df)),
     Field<Type>(move(df)),
     mesh_(df.mesh_),
     dimensions_(move(df.dimensions_))

src/OpenFOAM/fields/GeometricFields/GeometricField/GeometricField.C

@@ -720,6 +720,8 @@ Foam::GeometricField<Type, PatchField, GeoMesh>::GeometricField
     boundaryField_ == tgf().boundaryField_;
 
     tgf.clear();
+
+    readIfPresent();
 }