Converts the style context into a string representation.
The string representation always includes information about the name, state, id, visibility and style classes of the CSS node that is backing this. Depending on the flags, more information may be included.
This function is intended for testing and debugging of the CSS implementation in GTK+. There are no guarantees about the format of the returned string, it may change.
Flags that determine what to print
a newly allocated string representing this