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bug#18381: 24.3.93; Diary can wrongly be displayed in Calendar's window

From: martin rudalics
Subject: bug#18381: 24.3.93; Diary can wrongly be displayed in Calendar's window
Date: Fri, 05 Sep 2014 12:46:06 +0200

> The most conservative fix would seem to be to only change
> calendar-basic-setup, where it calls diary-view-entries.

Is that sufficient?  I thought the problematic call is that of
`display-buffer' in `calendar-in-read-only-buffer'.  I must admit that I
have a hard time debugging calendar code.

> I guess what we really want to say is "don't display the diary in the
> window that you just displayed the calendar in" (is that possible?),

We can make that window softly dedicated to the calendar.  But that's
not very clean.

> but
> failing that, simply removing display-buffer-in-previous-window seems to
> work. What's the cleanest way to do that? Binding
> display-buffer-overriding-action or display-buffer-fallback-action
> to an explicit list? display-buffer-fallback-action does not have the
> friendliest format to make "remove element X" straightforward,
> and is marked as a constant.

If we can identify the specific `display-buffer' or `pop-to-buffer'
calls in the calendar or diary code, we should pass it via the ACTION
argument.  That is, pass the value of `display-buffer-fallback-action'
with `display-buffer-in-previous-window' removed.

`display-buffer-overriding-action' is too drastic here and
`display-buffer-fallback-action' should not be used indeed.

Eventually, the code should be revised anyway.  For example, when a
window can be split, apparently the following sequence of actions is

(1) The calendar is displayed and its window is fit to the buffer.

(2) The diary is displayed in a window split off from the calendar
    window annihilating the effort of `fit-window-to-buffer' and leaving
    me with some two lines of the calendar.


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