bug#3419: 23.0.94; calc, calendar and temp-buffer-resize-mode

[martin rudalics]

>> But I'm not sure whether this is a bug in calc or temp-buffer-resize-mode.
>
> Or neither, and simply unexpected behavior.
> I've never used temp-buffer-resize-mode before, but if it's supposed to
> make a window a better size for displaying a temporary buffer, I'm
> surprised it doesn't change anything back when the buffer is killed or
> hidden.

Changing window sizes when `temp-buffer-resize-mode' exits is tricky.
That is, we could restore the window configuration that existed when
`temp-buffer-resize-mode' was started but that has the often unwanted
side-effect that other windows created (deleted) in the meantime get
deleted (resurrected).

> In this case, I'm not sure it's Calc's job to keep track of why
> it changed its window size.  Perhaps an option "Always start Calc with
> the initial window height" might be helpful.

Calc could make its windows fixed-size but that's hardly reasonable with
the current handling of fixed-size windows.  Any option affecting only
the initial size of Calc windows won't help in the present case either.
We could give Calc window parameters, say ideal-height and ideal-width,
and try to use these when exiting `temp-buffer-resize-mode' but writing
the corresponding code won't be trivial.

martin