patch courtesy of Simon Lees (SUSE) <sflees@suse.de>

BUG: 106343

Luís Pereira authored May 17, 2017 and Rex Dieter committed Feb 27, 2018

Commit 6387086e introduced LXQt support.
In xdg-open it assumed that LXQt and LXDE are the same. They aren't. LXQt
does not have pcmanfm, it has pcmanfm-qt.
LXQt doesn't want to rely on pcmamfm-qt to handle it: LXQt is very modular
and can be deployed without pcmanfm-qt.

open_generic() works for LXQt but it depends on mimeopen and mimetype. In
the future we will want, for sure, to drop those dependencies. That's the
reason for the existence of open_lxqt().

Credit to Ville Skyttä <ville.skytta@iki.fi>

The list of fallback browsers includes "chromium-browser"; however,
current installations of Chromium install the browser as "chromium".
(Some Chromium packages used to install "chromium-browser" due to binary
name conflicts, subsequently resolved.)

This was introduced in 0d6eebb2 and
prevents the script from running altogether.

https://bugs.freedesktop.org/show_bug.cgi?id=99699

gvfs- utils were deprecated in favour of new gio tool. Prefer gio
tool in recent GNOME 3 and Cinnamon over gvfs- utils.

When we are in the flatpak sandbox, use the flatpak portal to open
mailto uris.

When we are in the flatpak sandbox, use the flatpak portal to open
uris.

use
$XDG_CONFIG_HOME/mimeapps.list
instead of (deprecated)
$XDG_DATA_HOME/applications/mimeapps.list

using  2>/dev/null 1>&2 everywhere

xdg-open: Add proper quoting so that files with spaces in their names can be opened in generic mode and LXDE