graphviz-16.0.0

[Bruce Dubbs]

New major version.

[Bruce Dubbs]

## [16.0.0] – 2026-08-14

### Added

• A new agnnodes_z function is available as an alternative to agnnodes. This new function should be preferred in new code.

### Changed

• The core plugin’s JSON renderer no longer overwrites the graph’s IO discipline. This will only be relevant to users writing their own plugin-using code.
• Breaking: The agmemconcat function has been removed.
• Breaking: Support for the undocumented postaction attribute has been removed.
• gvmap discards cluster attribute information if any cluster attribute has a negative value. This should never occur in normal operation (the cluster program only attaches non-negative cluster attributes), but only if a user has incorrectly edited dot source.
• Breaking: The gvmap options -g, -l, and -p have been removed. Their functionality was never implemented and passing these had no effect.
• Breaking: xdot_linear_grad.n_stops and xdot_radial_grad.n_stops are now of type unsigned.

### Fixed

• Rendering multiple graphs with the core plugin’s FIG renderer no longer results in later outputs referring to colors defined in earlier outputs.
• libxdot rejects parsing of linear and radial gradients that claim a negative number of stops.
• Graphs that require “top sorting” during crossing minimization no longer cause Graphviz to crash. This was a regression in Graphviz 14.1.3.
• Fixed infinite loop by making object traversals skip newly created objects in mutable graphs. To do this, added API to get current object sequence numbers.

[Bruce Dubbs]

Fixed at commits

9d20c9bf71 Update to libpaper-2.3.0.
64cb77efd2 Update to graphviz-16.0.0.
62c1842fe1 Update to apache-ant-1.10.18.
6a4f30b757 Update to numpy-2.5.3 (Python Module).