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[Trogel <1509562@xxxxxxxxxxxxxxxxxx>]

My impression is that the affected KDE applications now rely on Qt5's
QIcon::fromTheme(...) to locate the icons. This is in line with the
documentation of KIconLoader::loadIconSet(...) (from source package
kiconthemes_5.15.0-0ubuntu1) that says: "@deprecated use
QIcon::fromTheme instead, which uses the iconloader internally".

But it seems that Qt5 only supports the very basic 'hicolor' icon theme
when not running in a KDE or Gnome session. The method
themeHint(ThemeHint hint) of the classes QKdeTheme and QGnomeTheme
support the hint QPlatformTheme::SystemIconThemeName, whereas the
implementation of this method for the class QGenericUnixTheme does not
support that hint (soruce package qtbase-opensource-src_5.4.2+dfsg-
2ubuntu9, file
src/platformsupport/themes/genericunix/qgenericunixthemes.cpp).
Therefore, I assume, the systems falls back to the fallback theme
'hicolor' using the hint QPlatformTheme::SystemIconFallbackThemeName. It
seems that 'hicolor' lacks of most icons needed by kate and the other
applications.

So it possibly requires a change in Qt5 rather than in specific KDE
applications or the KDE framework to get the icons back in these
applications when running in Xfce.

For a test (and as a rather dirty workaround) I have moved
/usr/share/icons/hicolor out of the way and replaced it with a symlink
to some other icon theme like 'oxygen' or 'elementary-xfce-darker'. For
example:

$ cd /usr/share/icons
$ sudo mv hicolor/ hicolor-bkp
$ sudo ln -s elementary-xfce-darker hicolor

Then I started kate, konsole, and dolphin manually from a terminal
window and they had most or even all of the missing icons back. When
started them from a launcher (from the panel in my case), the icons were
still missing. Now, after a fresh login to Xubuntu, the affected
applications have most or all of the missing icons, regardless of the
way I start them.

On the downside, now some other icons are missing. For instance, the
application icons of konqueror, kate, and other KDE applications are
missing in the launchers and in the Whisker Menu. But for the time being
I prefer to have a usable kate and happily accept some missing
application icons.

** Also affects: qtbase-opensource-src (Ubuntu)
   Importance: Undecided
       Status: New

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https://bugs.launchpad.net/bugs/1509562

Title:
  no icons for menu, folders, directories, files

Status in dolphin package in Ubuntu:
  Confirmed
Status in kate package in Ubuntu:
  Confirmed
Status in konsole package in Ubuntu:
  Confirmed
Status in qtbase-opensource-src package in Ubuntu:
  New

Bug description:
  no icons for menu, folders, directories, files

  I am using Xubuntu 15.10 as the Guest in Virtualbox 5.0.8 r103449.
  This happened after a recent Xubuntu update.

  Info:
  $ apt-cache policy dolphin
  dolphin:
    Installed: 4:15.08.2-0ubuntu1
    Candidate: 4:15.08.2-0ubuntu1
    Version table:
   *** 4:15.08.2-0ubuntu1 0
          500 http://mirror.cogentco.com/pub/linux/ubuntu/ wily/universe amd64 Packages
          100 /var/lib/dpkg/status

  ProblemType: Bug
  DistroRelease: Ubuntu 15.10
  Package: dolphin 4:15.08.2-0ubuntu1
  ProcVersionSignature: Ubuntu 4.2.0-16.19-generic 4.2.3
  Uname: Linux 4.2.0-16-generic x86_64
  ApportVersion: 2.19.1-0ubuntu3
  Architecture: amd64
  Date: Fri Oct 23 17:35:08 2015
  InstallationDate: Installed on 2015-06-01 (144 days ago)
  InstallationMedia: Xubuntu 15.10 "Wily Werewolf" - Alpha amd64 (20150521)
  ProcEnviron:
   LANGUAGE=en_US
   TERM=xterm
   PATH=(custom, no user)
   LANG=en_US.UTF-8
   SHELL=/bin/bash
  SourcePackage: dolphin
  UpgradeStatus: No upgrade log present (probably fresh install)

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