leaflet: Add the folded property

This is a boolean equivalent of the fold property, it is a needed convenience as is can be used in GtkBuilder declarations while the fold property is more convenient to use from C as it enables stronger typing.

added 1 commit

• 9d3c4705 - example: Bind back and close buttons visibility to fold

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mentioned in merge request !119 (merged)

I think what you want to say is

This is a boolean equivalent of the fold property, it is more convenient to use 
with property bindings (g_bind_property) than a GEnum.

This is IMHO not related to GtkBuilder or C it's just that you want to tie two boolean properties together. In fact the original MRs commit message (that lacked the example.c code) made wonder why a boolean r/o property should be GtkBuilder bindable while a GEnum r/o propery is not (which isn't the case of course). But it let me to finally cleaning up the open coded GEnums so no harm done.

This should also go into the docs.

merged

mentioned in merge request !122 (merged)