Checks to see if [method@GutterLines.add_class] was called with the @name for @line.
A faster version of this function is provided via [method@GutterLines.has_qclass] for situations where the quark is known ahead of time.
a line number starting from zero
a class name that may be converted, to a #GQuark
%TRUE if @line contains @name
See Implementation
Checks to see if [method@GutterLines.add_class] was called with the @name for @line.
A faster version of this function is provided via [method@GutterLines.has_qclass] for situations where the quark is known ahead of time.