ubuntu-elisp team mailing list archive

[Daniel Barrett <dbarrett@xxxxxxxxxxxxxxx>]

Public bug reported:

If you open an Emacs window in Plasma/KDE, and you try to highlight a
region of text by dragging the mouse, no highlighting appears. This is
because the color for highlighting a region is identical to the color
for the window background. I believe this color clash occurs between
Ubuntu's emacs24 package and Ubuntu's X resource settings.

To reproduce, log into Plasma, remove your $HOME/.emacs init file (so
you have no personal customizations), and run emacs in an X window:

  $ emacs

The window's background color is a light gray. Then type any text, click
and drag the mouse over the text (or use keystroke commands to define a
region). No highlighting appears, because the "region" color is also
light gray. You can see this by running the emacs command:

  M-x list-faces-display <ENTER>

I'll attach a screenshot so you can see that the "region" highlighting
doesn't show up.

The problem goes away if you disable the Ubuntu-supplied emacs init
files:

  $ emacs -Q

This is why I suspect the color is set badly in the Ubuntu emacs24
package.

You can see the X background color by running the "appres" command in a
shell window, which proves a light gray background is set, the same
color as region highlighting:

  *background:    #eff0f1

I tried to find the file where this background color is set, but I was
not successful.

ProblemType: Bug
DistroRelease: Ubuntu 16.04
Package: emacs24 24.5+1-6ubuntu1
ProcVersionSignature: Ubuntu 4.4.0-38.57-generic 4.4.19
Uname: Linux 4.4.0-38-generic x86_64
ApportVersion: 2.20.1-0ubuntu2.1
Architecture: amd64
CurrentDesktop: KDE
Date: Wed Sep 28 18:07:25 2016
InstallationDate: Installed on 2016-09-25 (3 days ago)
InstallationMedia: Kubuntu 16.04.1 LTS "Xenial Xerus" - Release amd64 (20160719)
SourcePackage: emacs24
UpgradeStatus: No upgrade log present (probably fresh install)

** Affects: emacs24 (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: amd64 apport-bug xenial

** Attachment added: "The "region" face shows no highlighting"
   https://bugs.launchpad.net/bugs/1628707/+attachment/4750558/+files/region.jpg

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https://bugs.launchpad.net/bugs/1628707

Title:
  Highlighting a region in emacs is invisible because region color
  equals window color

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