bug#6385: A slightly less aggressive fit-window-to-buffer

[martin rudalics]

> Sorry, I cannot take the time to try to pare things down to a single small 
case.
> Suffice it to say that I have never run into the problem before Emacs 23. In 
my
> case, this is about `fit-window-to-buffer' - that is where I see the problem.

So far I don't have the slightest idea what "the problem" is.  I don't
even know which window gets deleted: The one showing the buffer whose
window shall be fit (in which case it would be interesting to know
whether the window shall be shrunk or enlarged), or another window.

>> If you have a one line window and an nine lines window in a ten
>> lines frame and you want to enlarge the nine lines window by one
>> line Emacs 23 will probably delete the one line window.
>
> That sounds like a bug - it contradicts the doc.  Why shouldn't enlargement be
> prevented instead, in that case?

It's prevented in `adjust-window-trailing-edge'.  For `enlarge-window'
there's no such rule.  The latter's doc-string clearly states:

  "This function can delete windows if they get too small."

martin