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* ccwl/graphviz.scm (<graph-port>): New type.
(serialize): Support <graph-port> objects.
* tests/graphviz.scm (graph-port): New function.
("serialize ports correctly"): New test case.
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* ccwl/graphviz.scm: Import (ice-9 string-fun).
(serialize): When quoting strings, escape only the double quote
character.
* tests/graphviz.scm ("do not escape backslashes"): New test case.
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* ccwl/graphviz.scm (<html-string>): New type.
(escape-id): Delete function.
(serialize): New function.
(graph->dot): Use serialize instead of escape-id.
* tests/graphviz.scm: New file.
("serialize HTML strings correctly"): New test case.
* Makefile.am (SCM_TESTS): Register it.
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