Name of the font used to print line numbers on the left margin. If this property is unspecified, the text body font is used.
Accepted values are strings representing a font description Pango can understand. (e.g. "Monospace 10"). See pango.font_description.FontDescription.fromString for a description of the format of the string representation.
The value of this property cannot be changed anymore after the first call to the gtksource.print_compositor.PrintCompositor.paginate function.
Set lineNumbersFontName property.