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[groff] Spooky action at a distance in line adjustment...sometimes

From: G. Branden Robinson
Subject: [groff] Spooky action at a distance in line adjustment...sometimes
Date: Tue, 26 Jun 2018 09:27:47 -0400
User-agent: NeoMutt/20170113 (1.7.2)

Hi all,

Something that increasingly puzzles me more as I try to learn about
groff is the fact that changes to a paragraph N can causes changes in
the way paragraph N+M's lines are adjusted, even if there are no textual
or other changes to paragraph N+M itself.

Can someone tells me why this happens?  And, more mysteriously, why it
only _sometimes_ happens?

Is this perhaps a bug?  Is some variable or register not getting
re-zeroed at paragraph breaks when it should be?  This may be a man
package-specific issue.

Screenshot attached.  I'm also attaching example diff output and the
patches to the sources of the files pictured.


Attachment: groff-line-adjustment-spooky-action-at-a-distance.png
Description: PNG image

Attachment: spooky.txt
Description: Text document

Attachment: spooky.diff
Description: Text Data

Attachment: signature.asc
Description: PGP signature

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