BUG: redistributePar: single-step. See #1211

- override casename, procesorCase flags to guarantee reconstructed
case to be written to the undecomposed directory
- alternative is to construct a Zero mesh on the undecomposed
runTime and add all other bits to that but that has not been
pursued

src/OpenFOAM/db/Time/TimePaths.H

@@ -6,7 +6,7 @@
      \\/     M anipulation  |
 -------------------------------------------------------------------------------
     Copyright (C) 2011-2014 OpenFOAM Foundation
-    Copyright (C) 2016-2018 OpenCFD Ltd.
+    Copyright (C) 2016-2021 OpenCFD Ltd.
 -------------------------------------------------------------------------------
 License
     This file is part of OpenFOAM.
@@ -118,6 +118,9 @@ public:
         //- Return true if this is a processor case
         inline bool processorCase() const;
 
+        //- Set processor case status. Return old one
+        inline bool processorCase(const bool isProcessorCase);
+
         //- Return root path
         inline const fileName& rootPath() const;
 

src/OpenFOAM/db/Time/TimePathsI.H

@@ -5,7 +5,7 @@
     \\  /    A nd           | www.openfoam.com
      \\/     M anipulation  |
 -------------------------------------------------------------------------------
-    Copyright (C) 2018 OpenCFD Ltd.
+    Copyright (C) 2018-2021 OpenCFD Ltd.
 -------------------------------------------------------------------------------
 License
     This file is part of OpenFOAM.
@@ -39,6 +39,14 @@ inline bool Foam::TimePaths::processorCase() const
 }
 
 
+inline bool Foam::TimePaths::processorCase(const bool newProcCase)
+{
+    const bool oldProcCase = processorCase_;
+    processorCase_ = newProcCase;
+    return oldProcCase;
+}
+
+
 inline const Foam::fileName& Foam::TimePaths::rootPath() const
 {
     return rootPath_;