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bug#15322: VC log buffer scrolls itself

From: Dmitry Gutov
Subject: bug#15322: VC log buffer scrolls itself
Date: Sun, 03 May 2015 06:38:37 +0300
User-agent: Gnus/5.13 (Gnus v5.13) Emacs/25.0.50 (gnu/linux)

Andreas Schwab <address@hidden> writes:

> IMHO scrolling should only happen if point is still at BOB.

While this makes sense, and would help with fixing bug#20470 without
re-introducing the main pain point of this one, we don't have any easy
access to the "current" value of point, neither from
`vc-print-log-internal' (which is called before any output is shown),
nor from within the goto-location-func lambda it passes
`vc-log-internal-common', because the latter is called from
`vc--process-sentinel', after point is temporarily moved to
(process-mark p).

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