Hello everyone!

This is deal.II newsletter #360.
It automatically reports recently merged features and discussions about the 
deal.II finite element library.


## Below you find a list of recently proposed or merged features:

#19936: Choose more efficient way of asking whether a vector is zero. (proposed 
by bangerth; merged) https://github.com/dealii/dealii/pull/19936

#19935: PETSc + Bicgstab: use a wider range of tolerances. (proposed by 
drwells; merged) https://github.com/dealii/dealii/pull/19935

#19934: Bump actions/checkout from 6 to 7 (proposed by dependabot[bot]; merged) 
https://github.com/dealii/dealii/pull/19934

#19933: Simplify interface to vector access with hanging node constraints  
(proposed by kronbichler) https://github.com/dealii/dealii/pull/19933

#19931: Make step-90 compatible with TpetraWrappers (proposed by gassmoeller; 
merged) https://github.com/dealii/dealii/pull/19931

#19930: CI: fix gmsh version parsing. (proposed by drwells) 
https://github.com/dealii/dealii/pull/19930

#19929: Make a Tpetra vector function const (proposed by gassmoeller; merged) 
https://github.com/dealii/dealii/pull/19929

#19928: Space two pictures in the documentation of DataPostprocessorTensor. 
(proposed by bangerth) https://github.com/dealii/dealii/pull/19928

#19927: Unify the CG solver classes used in step-45 and step-32 (proposed by 
gassmoeller; merged) https://github.com/dealii/dealii/pull/19927

#19926: adolc: bypass a check so we throw an exception. (proposed by drwells; 
merged) https://github.com/dealii/dealii/pull/19926

#19925: Add changelog entry (proposed by iprusak; merged) 
https://github.com/dealii/dealii/pull/19925

#19924: Clarify some code comments. (proposed by bangerth) 
https://github.com/dealii/dealii/pull/19924

#19923: Don't mark member functions in source files as inline. (proposed by 
drwells; merged) https://github.com/dealii/dealii/pull/19923

#19922: Don't mark functions in anonymous spaces as inline. (proposed by 
drwells; merged) https://github.com/dealii/dealii/pull/19922

#19921: Use `ScalarLagrangePolynomialSimplex` in `FE_SimplexP` (proposed by 
dominiktassilostill) https://github.com/dealii/dealii/pull/19921

#19920: Make some variables const in `quadrature_lib.cc` (proposed by 
dominiktassilostill; merged) https://github.com/dealii/dealii/pull/19920

#19919: Fix dofs support contained within with constraints (proposed by 
tnschmid; merged) https://github.com/dealii/dealii/pull/19919

#19917: Make CGAL detection robust. (proposed by luca-heltai; merged) 
https://github.com/dealii/dealii/pull/19917

#19916: Add a pull request template with an AI disclosure statement (proposed 
by blaisb) https://github.com/dealii/dealii/pull/19916

#19915: Add to the documentation of quadrature classes. (proposed by bangerth; 
merged) https://github.com/dealii/dealii/pull/19915

#19914: InitFinalize: handle GMSH. (proposed by drwells; merged) 
https://github.com/dealii/dealii/pull/19914

#19913: Re-apply #19291. (proposed by bangerth; merged) 
https://github.com/dealii/dealii/pull/19913

#19912: step-39: update the perl script. (proposed by drwells; merged) 
https://github.com/dealii/dealii/pull/19912

#19911: CI: print the largest files in the Windows build directory. (proposed 
by drwells; merged) https://github.com/dealii/dealii/pull/19911

#19910: MatrixCreator: use type erasure. (proposed by drwells; merged) 
https://github.com/dealii/dealii/pull/19910

#19909: MatrixCreator: consolidate the assemblers. (proposed by drwells; 
merged) https://github.com/dealii/dealii/pull/19909

#19908: DerivativeApproximation: use type erasure. (proposed by drwells; 
merged) https://github.com/dealii/dealii/pull/19908

#19904: Arkode: introduce SplittingStepper (proposed by vovannikov) 
https://github.com/dealii/dealii/pull/19904

#19900: Improve error messages in FiniteElement::get_sub_fe(). (proposed by 
bangerth; merged) https://github.com/dealii/dealii/pull/19900

#19899: Better document FiniteElement::get_sub_fe(). (proposed by bangerth; 
merged) https://github.com/dealii/dealii/pull/19899

#19894: Deprecate other now-unused parts of MeshWorker. (proposed by bangerth; 
merged) https://github.com/dealii/dealii/pull/19894

#19893: Deprecate those classes that were only used in step-39. (proposed by 
bangerth; merged) https://github.com/dealii/dealii/pull/19893

#19892: Better document DoFTools::extract_dofs_with_support_contained_within(). 
(proposed by bangerth; merged) https://github.com/dealii/dealii/pull/19892

#19882: Only work-around HDF5 bug for sufficiently old versions. (proposed by 
bangerth; merged) https://github.com/dealii/dealii/pull/19882

#19878: MappingFE::compute_mapping_support_points(): re-use an array. (proposed 
by drwells; merged) https://github.com/dealii/dealii/pull/19878

#19863: Remove dependence of step-39 on old MeshWorker classes. (proposed by 
bangerth; merged) https://github.com/dealii/dealii/pull/19863

#19841: Add constant mode extraction to Tpetra MueLu (proposed by gassmoeller; 
merged) https://github.com/dealii/dealii/pull/19841

#19708: Fix support contained within without constraints (proposed by tnschmid; 
merged) https://github.com/dealii/dealii/pull/19708

#19630: VTKWrappers utilities -- part XI -- vtk <-> tria + 
manifold/boundary/material (proposed by luca-heltai; merged) 
https://github.com/dealii/dealii/pull/19630

#19614: High order simplex quadrature (proposed by dominiktassilostill; merged) 
https://github.com/dealii/dealii/pull/19614

#19347: Add Portable::MGTwoLevelTransfer (proposed by iprusak; merged) 
https://github.com/dealii/dealii/pull/19347

#19264: Hp dof identities for simplices, wedges and pyramids (proposed by 
dominiktassilostill; merged) https://github.com/dealii/dealii/pull/19264

#18178: Power iteration: check norm of initial vector (proposed by peterrum; 
merged) https://github.com/dealii/dealii/pull/18178

#16537: Precompute weights for parallel::CellWeights. (proposed by marcfehling; 
merged) https://github.com/dealii/dealii/pull/16537


## And this is a list of recently opened or closed discussions:

#19932: Compatibility of deal.II examples with Trilinos 17/Tpetrawrappers 
(opened) https://github.com/dealii/dealii/issues/19932

#19918: Improve setup costs of TwoLevelTransfer::reinit_geometric_transfer 
(opened) https://github.com/dealii/dealii/issues/19918

#19903: Re-apply #19291. (opened and closed) 
https://github.com/dealii/dealii/issues/19903

#19782: PreconditionChebyshev::vmult should not pick up state of `dst` vector 
(closed) https://github.com/dealii/dealii/issues/19782

#19777: Regression tester regressed d681af (closed) 
https://github.com/dealii/dealii/issues/19777

#19741: Regression tester regressed cbe48e (closed) 
https://github.com/dealii/dealii/issues/19741

#19696: extract_dofs_with_support_contained_within() returns wrong results in 
parallel (closed) https://github.com/dealii/dealii/issues/19696

#19645: Regression tester regressed 6cb533 (closed) 
https://github.com/dealii/dealii/issues/19645

#19608: Regression tester regressed 1a2ab6 (closed) 
https://github.com/dealii/dealii/issues/19608

#19574: Regression tester regressed f112b1 (closed) 
https://github.com/dealii/dealii/issues/19574

#19521: Guard HDF5 initialization to avoid FP exceptions in tests.h with HDF5 
version number. (closed) https://github.com/dealii/dealii/issues/19521

#19515: Regression tester regressed dc205d (closed) 
https://github.com/dealii/dealii/issues/19515

#19447: How to write into non-locally-owned entries of fully distributed 
TpetraWrappers::Vectors. (closed) https://github.com/dealii/dealii/issues/19447

#19441: Regression tester regressed 40b6df (closed) 
https://github.com/dealii/dealii/issues/19441

#17696: Deprecate IntegrationInfo and IntegrationInfoBox. (closed) 
https://github.com/dealii/dealii/issues/17696

#15946: CMake: use pkgconfig information when available (closed) 
https://github.com/dealii/dealii/issues/15946

#15839: Remove MeshWorker framework (closed) 
https://github.com/dealii/dealii/issues/15839

#13668: Make CGAL detection robust (closed) 
https://github.com/dealii/dealii/issues/13668

#10474: DataOut::add_data_vector vector handling (closed) 
https://github.com/dealii/dealii/issues/10474

#9867: Use tensor product evaluation for MappingQGeneric::fill_fe_face_values 
(closed) https://github.com/dealii/dealii/issues/9867

#3845: Allow more element types in MGTransferMatrixFree (closed) 
https://github.com/dealii/dealii/issues/3845


A list of all major changes since the last release can be found at 
https://www.dealii.org/developer/doxygen/deal.II/recent_changes.html.


Thanks for being part of the community!


Let us know about questions, problems, bugs or just share your experience by 
writing to [email protected], or by opening issues or pull requests at 
https://www.github.com/dealii/dealii.
Additional information can be found at https://www.dealii.org/.

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