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bug#32825: 27.0.50; Deterministic window management

From: martin rudalics
Subject: bug#32825: 27.0.50; Deterministic window management
Date: Wed, 07 Nov 2018 10:23:06 +0100

> Isn't this bad that this function does the double work, i.e.
> first displays the buffer, then reverts, and if everything is right,
> displays the same buffer again.  Shouldn't it display the buffer
> only once, then check if everything is right, and revert only
> if not.

The primal problem this was supposed to solve is:

(1) Get the size (typically the body width) of the window supposed to
    display a buffer (typically a doc or man buffer).

(2) Format the buffer in some way so that it fits into (1)'s size.

(3) Call 'display-buffer' to actually display the buffer.

In such a scenario the time to perform (2) usually dwarfs the time
needed by (1) so it shouldn't be that bad.

We obviously could use this approach to revert 'display-buffer'
whenever it did something bad.  But we shouldn't do that by default,
the overhead for storing the configurations is not negligible.


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