Merge branch 'jolivet/safeguard-pchpddm-schur-ci' into 'main'

Housekeeping + more safeguards in PCHPDDM

See merge request petsc/petsc!8859

Housekeeping

Merge branch 'barry/2025-10-18/optimize-aij-ops' into 'main'

Refactor handling of diagonal marking in *AIJ and SELL matrices

See merge request petsc/petsc!8797

- Replace MatMissingDiagonal() and MatMarkDiagonals_SeqXXX() with MatGetDiagonalMarkers_SeqXXX()

- Mat_SeqXXX->diag is not automatically created during MatAssemblyEnd() saving memory and time

- Replace MatMissingDiagonal() and MatMarkDiagonals_SeqXXX() with MatGetDiagonalMarkers_SeqXXX()

- Mat_SeqXXX->diag is not automatically created during MatAssemblyEnd() saving memory and time

- Accessing Mat_SeqXXX->diag now requires the use of MatGetDiagonalMarkers_SeqXXX() except when the current values are known to be correct; for example during numerical factorizations and solves

- Mat_SeqXXX->diag is now never shared among matrices; hence the free_diag flag is gone. That was always a risky proposition since any of the owning matrices could chang the values thus making them incorrect for other owners.

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Merge branch 'jolivet/clang-format-21' into 'main'

clang-format-21

See merge request petsc/petsc!8202

Remove unnecessary braces around one-liners

git grep -lE "[ ]*(if|for|while) \(.*\) {[^;]*;[^;]*}$" -- '*.c' '*.cxx' '*.cu' '*.h' '*.hpp' '*.cpp' | xargs sed -i '' -E 's#([ ]*)(if|for|while) \((.*)\

Remove unnecessary braces around one-liners

git grep -lE "[ ]*(if|for|while) \(.*\) {[^;]*;[^;]*}$" -- '*.c' '*.cxx' '*.cu' '*.h' '*.hpp' '*.cpp' | xargs sed -i '' -E 's#([ ]*)(if|for|while) \((.*)\) {([^;]*);([^;]*)}$#\1\2 \(\3\)\4;\5#'

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Merge branch 'barry/2024-05-29/minor-fortran-stub-cleanup' into 'main'

More improvements to Fortran stubs and interfaces

See merge request petsc/petsc!7598

This requires some changes to user FORTRAN code

Pass PETSC_NULL_XXX_ARRAY when passing a NULL as an argument that is expecting an array
Pass PETSC_NULL_ENUM when argument returns an enum instead of

This requires some changes to user FORTRAN code

Pass PETSC_NULL_XXX_ARRAY when passing a NULL as an argument that is expecting an array
Pass PETSC_NULL_ENUM when argument returns an enum instead of PETSC_NULL_INTEGER
Pass arrays (and not scalar values) when the argument is expecting an array; this means replace, for example, the argument v with [v]
Use PetscObjectIsNull(obj) to check if the object is NULL, instead of obj == PETSC_NULL_XXX

The compiler will now automatically prevent you from using the wrong argument type for the first three bullets above
This will also require an update sowing with the new sowing branch this MR is using.

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Merge branch 'barry/2024-04-13/fix-sowing-strings' into 'main'

Update PETSc to use sowing bfort that handles string arguments and PETSC_NULL_INT

See merge request petsc/petsc!7480

Update source code removing all unneeded /*@C and associated manual stubs and interfaces

Merge branch 'jolivet/clang-format-18' into 'main'

clang-format version 18

See merge request petsc/petsc!6902

checkbadSource: rules for PetscFunctionBegin and derivatives

Merge branch 'jolivet/rm-first-empty-line' into 'main'

Remove first and last empty lines

See merge request petsc/petsc!6892

Remove first and last empty lines

Merge branch 'jolivet/mumps-schur-pchpddm' into 'main'

Minor MAT[SOLVERMUMPS|DIAGONAL] and PCHPDDM improvements

See merge request petsc/petsc!6880

MatRestoreRow(): avoid duplicated operations

Merge branch 'jacobf/2023-07-19/lint-apply-ts' into 'main'

Manual linter fixes: ts

See merge request petsc/petsc!6736

... and apply it

Merge branch 'jacobf/2023-07-17/lint-apply-mat' into 'main'

Linter fixes: Mat

See merge request petsc/petsc!6718

Manual linter fixes: mat

Merge branch 'jacobf/2023-06-30/enable-doc-lint' into 'main'

Enable docs linting

See merge request petsc/petsc!6667

Lint apply: mat

Merge remote-tracking branch 'origin/release'

Merge branch 'barry/2023-05-27/improve-tutorials/release' into 'release'

Minor cleanup of website tutorials

See merge request petsc/petsc!6520

change to consistent use of ch_xxx for chapter names in the docs, instead of a mix of ch_xx and chapter_xx