Single quotes erroneously replaced with escaped double-quotes

[coolbutuseless]

According to the Dot language spec () only the double-quote character should be escaped i.e. a literal " should be included in a dot file as \"

In grViz() however it appears that a single-quote (') is escaped to be \" :

diagram <- gsub(x = diagram, "'", "\"")

This changes any single quotes (for example apostrophes in words) with a double quote character.

E.g. A node label they'll is erroneously converted into the dot output they"ll

Posslbe fix: Change the gsub pattern to be '"' instead of "'"