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What's new in this version:

Important notice:
- This bug fix release breaks ABI compatibility with Octave 6.2.0. Re-build binaries (like .oct or .mex files) when updating to this version.

Improvements and fixes:
- ls-hdf5.cc: Avoid throwing inside HDF5 function
- ls-hdf5.cc: Handle non-zero terminated type strings
- Fix occasional segfault in symbfact
- fsolve.m: Fix undefined output error when using Output function
- Avoid ambiguous call to pow
- Fix context link when creating handle to nested function
- print.m: Warn when figure is too large to be printed to output page
- Defer clearing function vars until stack frame is deleted
- Avoid memory leaks when returning handles to nested functions
- Hold references to closure frames in anon functions if needed
- eigs: Prevent possible segmentation fault at exit
- Issue warning when gnuplot graphics toolkit is initialized
- mpoles.m: Fix detection of pole multiplicity
- Perform shutdown actions in interpreter destructor
- qz.cc: Return correct number of eigenvalues
- qz.cc: Let test pass with LAPACK 3.9.1 and earlier versions
- pkg.m: Use default prefixes unless otherwise set previously
- betaincinv.m: Correctly handle small inputs
- betaincinv.m: Correctly handle inputs very close to 1.0
- unistd-wrappers.c: Allocate sufficient memory for new_argv
- Mark system functions correctly if OCTAVE_HOME is non-canonical
- Mark compiled system functions correctly if OCTAVE_HOME is non-canonical
- Return proper number of stack frames for dbstack (N) call
- Avoid ambiguous match of overloaded function
- print: Fix error when "px" word is present in a figure
- logm.m: Fix check for real negative values in complex vector
- hist.m: Improve handling and docstring for third parameter “norm”
- logm.m: Allow tolerance in check for real negative values in complex vector
- expm.m, logm.m: Use function isdiag to detect if input is a diagonal matrix
- Fix scoping issue for handles to sibling nested functions
- ls-mat5.cc: Avoid integer overflow in calculation of buffer size for zlib
- Avoid crash with dbquit when executing command in terminal from GUI

GUI:
- Fix calling external editor
- Fix missing file suffix .m when saving a new script
- Do not run files that are not saved as Octave files
- Fix confirm overwrite for native editor file “save as” dialogs
- Fix crash when GUI tries to restore missing previous Octave dir
- Fix restoring the horizontal position of docked GUI widgets
- Prevent floating widgets from re-opening after restart
- Avoid crash in GUI for rmdir("")
- Fix EOL mode when saving files under new names
- Fix auto indentation of switch-structure in GUI editor
- Avoid crash when closing GUI with open editor tabs
- octave-qscintilla.cc (contextmenu_run): Fix keyboard command handling

Build system / Tests:
- build: Check for stropts.h
- build: Make relocation of dependencies with Octave optional
- build: Set necessary flags to allow execution on Windows Vista
- build: Use correct path to octave binary in build tree on macOS.
- build: Fix typo in folder to libraries when building .oct or .mex files
- build: Set DL_LDFLAGS in the build rules for .oct or .mex files
- Declare base_parser destructor virtual
- Move top-level REPL from interpreter to evaluator
- Fix compilation error with iconv_t on Solaris
- lo-array-errwarn.cc: Include <limits>
- Use std::size_t and std::ptrdiff_t in C++ code
- Use std::size_t in more instances
- Fix error if test suite is run before Octave is installed
- tests: Relax tolerance for some tests on macOS
- logspace.m: Mark tests as known to fail on macOS
- hist.m: Use deterministic test
- rgb2ind.m: Reduce memory usage and eliminate randomness in test
- logm.m: Allow larger tolerance for test on macOS
- rgb2ind.m: Suppress output in test
- lscov.m: Relax BIST tolerance to pass with OpenBLAS

Documentation:
- Improve documentation for log2 function
- ind2sub: Fix typo in “see also” section of docstring
- mrdivide, mldivide: Document that functions might return minimum norm solutions
- Improve Differential Equations chapter and example for lsode
- Clarify usage of “Depends” keyword in package DESCRIPTION file
- Add note that wildcard patterns for save are glob patterns
- Change example for Delaunay triangulation to match the generating code
- Document single precision issues with OpenGL graphics toolkits
- Minor changes to documentation of single precision issues with OpenGL
- Expand on documentation for command syntax
- isprop.m: Document that function only works on graphics objects in Octave 6.X
- Explain how to write dual-purpose executable scripts and Octave functions
- Update keyword docstrings
- Use Texinfo commands to improve transpose() docstring rendering
- betainc.m, betaincinv.m: Correct non-TeX definition of beta incomplete integral
- Grammarcheck documentation ahead of 6.3 release
- Spellcheck documentation ahead of 6.3 release