graphviz 15.1.1

Changed

• When using dl_iterate_phdr to discover the plugin directory, the default compiled-in plugin directory is only overridden if dl_iterate_phdr successfully discovers the plugin directory. Previously if the dl_iterate_phdr search failed, the plugin directory would be considered the empty string.
• The cells of an HTML table are now emitted after the table border and rules. The main effect of this is, when post-styling a table with CSS, cell content remains visible. I.e. Z-ordering is more intuitive.