[Bug 1658556] Re: watch -c --differences=permanent misbehaves (highlights everything)

[Launchpad Bug Tracker]

Status changed to 'Confirmed' because the bug affects multiple users.

** Changed in: procps (Ubuntu)
       Status: New => Confirmed

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https://bugs.launchpad.net/bugs/1658556

Title:
  watch -c --differences=permanent misbehaves (highlights everything)

Status in procps package in Ubuntu:
  Confirmed

Bug description:
  If the watch -c and --differences=permanent options are combined, then
  upon the first update _every_ character is highlighted even if nothing
  has ever changed.

  It appears that -c ("Interpret ANSI color and style sequences")
  tickles a bug in the persistence logic.  Regular non-permanent
  highlighting (with option -d) works okay with -c.

  STEPS TO REPRODUCE:

  1.  /usr/bin/watch -c --differences=permanent -n 1 echo This never
  changes

  RESULTS:  After one second all output is highlighted

  EXPECTED RESULTS: No highlighting until something changes

  ProblemType: Bug
  DistroRelease: Ubuntu 16.04
  Package: procps 2:3.3.10-4ubuntu2.3
  ProcVersionSignature: Ubuntu 4.4.0-62.83-generic 4.4.40
  Uname: Linux 4.4.0-62-generic x86_64
  NonfreeKernelModules: nvidia_uvm nvidia_drm nvidia_modeset nvidia
  ApportVersion: 2.20.1-0ubuntu2.5
  Architecture: amd64
  CurrentDesktop: Unity
  Date: Sun Jan 22 17:35:09 2017
  InstallationDate: Installed on 2013-08-06 (1266 days ago)
  InstallationMedia: Ubuntu 13.04 "Raring Ringtail" - Release amd64 (20130424)
  SourcePackage: procps
  UpgradeStatus: Upgraded to xenial on 2016-05-11 (257 days ago)

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