bug#9287: Mention `displayed-month' and `displayed-year' in `diary-mark-entries-hook' documentation

[Lars Magne Ingebrigtsen]

Štěpán Němec <stepnem@gmail.com> writes:

> The two variables, which fortunately do appear to be dynamically bound
> to the middle month and year currently displayed in the calendar window
> at the time of running `diary-mark-entries-hook', are _crucial_ for
> being able to define useful marking functions[1]. Please document this
> (AFAICT they are currently not mentioned anywhere; I had to read much of
> calendar.el and holidays.el to figure it out).

Do you have a suggestion for a suitable documentation?

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