Returns the current serial number of @context. The serial number is
initialized to an small number larger than zero when a new context
is created and is increased whenever the context is changed using any
of the setter functions, or the #PangoFontMap it uses to find fonts has
changed. The serial may wrap, but will never have the value 0. Since it
can wrap, never compare it with "less than", always use "not equals".
This can be used to automatically detect changes to a #PangoContext, and
is only useful when implementing objects that need update when their
#PangoContext changes, like #PangoLayout.
Returns the current serial number of @context. The serial number is initialized to an small number larger than zero when a new context is created and is increased whenever the context is changed using any of the setter functions, or the #PangoFontMap it uses to find fonts has changed. The serial may wrap, but will never have the value 0. Since it can wrap, never compare it with "less than", always use "not equals".
This can be used to automatically detect changes to a #PangoContext, and is only useful when implementing objects that need update when their #PangoContext changes, like #PangoLayout.