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bug#22637: 25.1.50; `mode-line` face `:height` incompatible with `scroll

From: Eli Zaretskii
Subject: bug#22637: 25.1.50; `mode-line` face `:height` incompatible with `scroll-conservatively 101`.
Date: Tue, 16 Feb 2016 17:51:28 +0200

> Date:  Mon, 15 Feb 2016 18:51:26 -0800
> From:  Keith David Bershatsky <address@hidden>
> Cc:  address@hidden
> The same situation mentioned in my email earlier today (02/15/2016) is also 
> present in the first test case that we looked at for #22637.   I.e., after an 
> insertion in the first test case, the `window-scroll-functions` hook never 
> fires after `window-start` is corrected.  So a user seeking to use the 
> `window-scroll-functions` hook following a large insertion (e.g., a large 
> yank, and so forth) is out of luck in that situation in terms of using a 
> correct `window-start`.  I have already dealt with it for the 
> `window-start-end-hook` by forcing a call every command loop thereby 
> bypassing "optimization 3"; however, the WSF has no fix at this time.

The reason window-scroll-functions aren't run in both of these test
cases is that what happens there is not considered "scrolling".
Scrolling is informally defined as either an explicit call to a
function that scrolls the window, or a pseudo-scroll done by the
display engine when it detects that some part of the window's previous
display is still present, but in a different vertical position.
Moving point to an arbitrary location is neither.

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