Bug 33352

Description of problem:
Choosing "Help" in programs installed in a minimal XFCE install (e.g. atril, engrampa) does absolutely nothing; no help is displayed and the click is silently ignored. However, help files for these programs are available in /usr/share/help/C/ and they ought to be displayed.

Choosing Help in a Gnome application (e.g. sysprof) causes "Could not show link. The specified location is not supported". 

Neither yelp nor khelpcenter was installed in this (mostly) default installation, so there is probably simply no application available to show help. Unless I missed something and XFCE supplies its own application (that is not working), likely yelp should be installed in a minimal XFCE installation. After installing yelp manually, help in all the programs mentioned above works fine.

Note that this was a task-xfce-minimal installation, so maybe leaving out yelp was deliberate. If so, then there should probably be a shim installed in place of gnome-help to direct the user to install to install gnome-help for help. Having the user's help request silently ignored is rather unfriendly. Since xmessage seems to be installed already, installing a one-line shell script that runs "xmessage 'Install gnome-help for help'" as an alternative for gnome-help, that gets replaced if gnome-help is installed, should work. Or, just install yelp since it's only 2.6 MB large.

Version-Release number of selected component (if applicable):
task-xfce-minimal-4.18-1.mga9.src.rpm

How reproducible:
Likely any bare-bones XFCE installation will show this.

Steps to Reproduce:
1. Install XFCE on a new system.
2. Try "Help" in several programs like the ones above.
3. Note the lack of help being displayed.

Note that many XFCE programs will launch Firefox and display a remote help page with information on a program (e.g.  mousepad, deluge) because help files aren't  packaged with the application (so there's nothing local to display).

See also #33339.