[Bug 1452771] [NEW] fill-paragraph causes screen jump as if it is calling

[Jeff Abrahamson]

Public bug reported:

fill-paragraph (from fill.el) causes point to recenter alternately to
center, top, and bottom of screen, as if recenter-top-bottom (from
window.el) is being called.

I expect fill-paragraph to be idempotent: if it does nothing, it should
leave the window alone (possibly marking it as dirty).  In particular,
it is hard to see exactly what it has done if the text moves
substantially.  This is new behavior since the upgrade from 14.10.

ProblemType: Bug
DistroRelease: Ubuntu 15.04
Package: emacs 46.1
ProcVersionSignature: Ubuntu 3.19.0-16.16-generic 3.19.3
Uname: Linux 3.19.0-16-generic i686
ApportVersion: 2.17.2-0ubuntu1
Architecture: i386
CurrentDesktop: i3
Date: Thu May  7 16:54:19 2015
EcryptfsInUse: Yes
InstallationDate: Installed on 2010-03-13 (1881 days ago)
InstallationMedia: Ubuntu-Netbook-Remix 9.10 "Karmic Koala" - Release i386 (20091028.4)
PackageArchitecture: all
SourcePackage: emacs-defaults
UpgradeStatus: Upgraded to vivid on 2015-05-06 (0 days ago)

** Affects: emacs-defaults (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: apport-bug i386 vivid

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https://bugs.launchpad.net/bugs/1452771

Title:
  fill-paragraph causes screen jump as if it is calling

Status in emacs-defaults package in Ubuntu:
  New

Bug description:
  fill-paragraph (from fill.el) causes point to recenter alternately to
  center, top, and bottom of screen, as if recenter-top-bottom (from
  window.el) is being called.

  I expect fill-paragraph to be idempotent: if it does nothing, it
  should leave the window alone (possibly marking it as dirty).  In
  particular, it is hard to see exactly what it has done if the text
  moves substantially.  This is new behavior since the upgrade from
  14.10.

  ProblemType: Bug
  DistroRelease: Ubuntu 15.04
  Package: emacs 46.1
  ProcVersionSignature: Ubuntu 3.19.0-16.16-generic 3.19.3
  Uname: Linux 3.19.0-16-generic i686
  ApportVersion: 2.17.2-0ubuntu1
  Architecture: i386
  CurrentDesktop: i3
  Date: Thu May  7 16:54:19 2015
  EcryptfsInUse: Yes
  InstallationDate: Installed on 2010-03-13 (1881 days ago)
  InstallationMedia: Ubuntu-Netbook-Remix 9.10 "Karmic Koala" - Release i386 (20091028.4)
  PackageArchitecture: all
  SourcePackage: emacs-defaults
  UpgradeStatus: Upgraded to vivid on 2015-05-06 (0 days ago)

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