Patch provided by Simon P.

Clicking on, or dragging, the slider of the display brightness
slider of the plugin menu causes the plugin to crash. This
behaviour has been present since this feature was introduced.

I've tracked down the cause to the way the "value-changed"
signal on the scale_menu_item object is handled. The signal
is defined with a gdouble data item for the range value (but
isn't used anywhere?) while the callback function
range_value_changed_cb isn't expecting this data.

By changing to g_signal_connect_swapped for this signal in
function battery_button_show_menu & swapping the parameters
in the callback function, the range slider is now working for
me.

195 translated messages.

Transifex (https://www.transifex.com/projects/p/xfce/).

Switch to using pkexec instead of the sudo helper. This allows
users to use things such as fingerprint readers and other auth
methods to verify credentials. A default polkit rule is shipped
in this patch as well in the org.xfce.power.policy.

186 translated messages, 16 untranslated messages.

Transifex (https://www.transifex.com/projects/p/xfce/).

xfpm-settings has some XFPM_DEBUG messages but no way to enable
them, the patch adds the same --debug flag as xfpm's daemon has.

171 translated messages, 33 untranslated messages.

Transifex (https://www.transifex.com/projects/p/xfce/).

DPMS should be available on all systems nowadays, at least where
xfce4-power-manager is expected to run. So make it a hard requirement.

197 translated messages, 7 untranslated messages.

Transifex (https://www.transifex.com/projects/p/xfce/).

Also rearrange the items to better reflect the layout in settings dialog.
It's easier to find one's way around that way.

If it's used by all components, that's the place it should be.

This makes use of the xfconf property introduced in the previous commit.
Initially, min_level is set to -1, which causes automatic determination of
the best minimum level when the slider is created.

Setting a minimum level other than 0 might only make sense for newer
laptops, which can be heuristically determined by looking at the available
range of brightness steps. Any backlight interface providing more than 100
steps will set the minimum level the slider will support to 5, which is
barely enough light to see the screen contents. The user can change this
via xfce4-settings-editor, or its command line companion xfconf-query.

Some laptops can turn off the backlight completely by setting the brightness
to 0. Usually, this is no problem, but in case the brightness keys do not
work for whatever reason, then the user can own himself and be left in the
dark, with no easy way to regain control of the backlight.

So as a first step, let's introduce a new xfconf property to track the
minimum value the plugin slider can be set to.

I still noticed a slow-down on my machine even with the newly introduced
update timer. Increasing it to 50ms is still enough for not causing the
updates lagging behind too much, while filtering enough events to keep
the widget response snappy even with two monitors attached.

204 translated messages.

Transifex (https://www.transifex.com/projects/p/xfce/).

Take the x/ythickness into account when setting the size request and
get the closest sharpest icon instead of GTK_ICON_LOOKUP_FORCE_SIZE.
Also, apply some Gtk+ style properties that the convenience functions
of the panel provide by default for panel plugin buttons.

Max minutes was limited to 50.

204 translated messages.

Transifex (https://www.transifex.com/projects/p/xfce/).

Most parts in the power manager are named in different ways. Let's try
to find a more uniform naming scheme for consistency reasons. This commit
renames the UI widgets. It is only an internal change and does not
effect anything visible to the user.

204 translated messages.

Transifex (https://www.transifex.com/projects/p/xfce/).

204 translated messages.

Transifex (https://www.transifex.com/projects/p/xfce/).

191 translated messages, 13 untranslated messages.

Transifex (https://www.transifex.com/projects/p/xfce/).

204 translated messages.

Transifex (https://www.transifex.com/projects/p/xfce/).

188 translated messages, 16 untranslated messages.

Transifex (https://www.transifex.com/projects/p/xfce/).

173 translated messages, 31 untranslated messages.

Transifex (https://www.transifex.com/projects/p/xfce/).

193 translated messages, 11 untranslated messages.

Transifex (https://www.transifex.com/projects/p/xfce/).

204 translated messages.

Transifex (https://www.transifex.com/projects/p/xfce/).

204 translated messages.

Transifex (https://www.transifex.com/projects/p/xfce/).