#1493 Handle a Petsc keyword that disappeared with v3.12.

Sources/ThirdParty/Wrappers/Petsc/Solver/Internal/Convergence/SnesConvergenceReason.cpp

@@ -58,12 +58,14 @@ namespace MoReFEM
                     return ret;
                 }
                 
-                
+
+				#if PETSC_VERSION_LT(3, 12, 0)
                 const std::string& SnesConvergenceReason<SNES_CONVERGED_TR_DELTA>::Explanation()
                 {
                     static std::string ret("SNES_CONVERGED_TR_DELTA in Petsc; no further documentation available.");
                     return ret;
                 }
+				#endif 
                 
                 
                 const std::string& SnesConvergenceReason<SNES_DIVERGED_FUNCTION_DOMAIN>::Explanation()

Sources/ThirdParty/Wrappers/Petsc/Solver/Internal/Convergence/SnesConvergenceReason.hpp

@@ -115,8 +115,8 @@ namespace MoReFEM
                 };
 
 
-
-                template<>
+				# if PETSC_VERSION_LT(3, 12, 0)
+				template<>
                 struct SnesConvergenceReason<SNES_CONVERGED_TR_DELTA>
                 {
 
@@ -126,6 +126,7 @@ namespace MoReFEM
                     static const std::string& Explanation();
 
                 };
+				# endif
 
 
                 template<>

Sources/ThirdParty/Wrappers/Petsc/Solver/Internal/Convergence/SnesConvergenceReason.hxx

@@ -60,11 +60,13 @@ namespace MoReFEM
                 }
 
 
+				# if PETSC_VERSION_LT(3, 12, 0)
                 inline constexpr convergence_status SnesConvergenceReason<SNES_CONVERGED_TR_DELTA>
                 ::GetConvergenceStatus() noexcept
                 {
                     return convergence_status::yes;
                 }
+				# endif
 
 
                 inline constexpr convergence_status SnesConvergenceReason<SNES_DIVERGED_FUNCTION_DOMAIN>

Sources/ThirdParty/Wrappers/Petsc/Solver/Snes.cpp

@@ -410,8 +410,10 @@ namespace MoReFEM
                         return GetNonLinearConvergenceReasonHelper<SNES_CONVERGED_SNORM_RELATIVE>();
                     case SNES_CONVERGED_ITS:
                         return GetNonLinearConvergenceReasonHelper<SNES_CONVERGED_ITS>();
+					#if PETSC_VERSION_LT(3, 12, 0)
                     case SNES_CONVERGED_TR_DELTA:
                         return GetNonLinearConvergenceReasonHelper<SNES_CONVERGED_TR_DELTA>();
+					#endif
                     case SNES_DIVERGED_FUNCTION_DOMAIN:
                         return GetNonLinearConvergenceReasonHelper<SNES_DIVERGED_FUNCTION_DOMAIN>();
                     case SNES_DIVERGED_FUNCTION_COUNT: