It is odd to switch workspaces on the primary monitor when panning on
a monitor without workspaces, so reject the gesture on non-primary
monitors when workspaces-only-on-primary is disabled.
https://bugzilla.gnome.org/show_bug.cgi?id=766883
It is odd to switch workspaces using the scroll wheel when the pointer
is on a monitor without workspaces, so only handle scroll events on
non-primary monitors when workspaces-only-on-primary is disabled.
https://bugzilla.gnome.org/show_bug.cgi?id=766883
We allow activating a workspace by clicking it when we know that
the user did not try to select a window and missed (namely: the
workspace is empty). However we currently always check for an
empty workspace on the primary monitor, which doesn't make sense
when the click happened on a different monitor.
https://bugzilla.gnome.org/show_bug.cgi?id=766883
Both the Overview::scroll-event and actions added via addAction()
are meant to work anywhere in the overview, but for now only work
on the primary monitor. Move the handling to the background group
that is known to span all outputs to fix.
https://bugzilla.gnome.org/show_bug.cgi?id=766883
The stack was used to overlay a message indicator over the overview
group. That indicator is long gone, so there's no longer a need for
an intermediate actor in the hierarchy.
https://bugzilla.gnome.org/show_bug.cgi?id=766883
Initializing the upper bound to zero means that on panning we'd start
scrolling from the first workspace even if the current workspace when
entering the overview was different since StAdjustment clamps the
value to be inside bounds.
https://bugzilla.gnome.org/show_bug.cgi?id=766883
The underlying logind API does not only indicate whether suspend is
available, but also whether the user is eligible for executing the
operation without further authentication. This information can be
relevant, so pass it to the callback.
https://bugzilla.gnome.org/show_bug.cgi?id=725960
If the source actor is destroyed while the popupMenu is shown -- this
can happen if a non favorite application was closing or crashes -- the
menu actor is improperly destroyed.
This makes the popupMenu close first and does a clean ungrab instead.
https://bugzilla.gnome.org/show_bug.cgi?id=757556
The various switcher keybindings are handled identically, except for
the popup that is shown; update the code to reflect that instead of
duplicating the code again and again.
https://bugzilla.gnome.org/show_bug.cgi?id=730739
The code to handle cycling through windows without showing a popup
was removed from mutter a while ago, which left the corresponding
keybindings mostly broken (i.e. they now only switch between two
windows). With the various switch-foo keybindings handled by the
shell, it is now easier to take over the cycle-foo keybindings as
well.
https://bugzilla.gnome.org/show_bug.cgi?id=730739
Logind recently got support for a hint property in Session Object to
inform if session is Locked or not. It is up to desktop environments
to keep this property up to date.
https://bugzilla.gnome.org/show_bug.cgi?id=764773
If the drag actor is destroyed before the animation
callback is called, the callback is never called and
we're sticked with dnd grabing the events after we
dropped the target.
https://bugzilla.gnome.org/show_bug.cgi?id=757676
We currently show the orientation lock button when an accelerometer
is present, however gnome-settings-daemon's xrandr plugin only applies
rotation when a builtin monitor is present. Update the button's
visibility to match gnome-settings-daemon.
https://bugzilla.gnome.org/show_bug.cgi?id=765267
ClutterLayoutManager's size request methods have an additional container
argument before the for-width/height parameters compared to ClutterActor.
https://bugzilla.gnome.org/show_bug.cgi?id=763068
While a channel has pending messages, it will pop up again when
dismissed. That is clearly not what users expect, so clear them
out first before closing a channel.
https://bugzilla.gnome.org/show_bug.cgi?id=747991
Let's make it really simple and ask user interactively, once. This
simplifies things for:
* Privacy panel of gnome-control-center as it doesn't have to filter
applications.
* Apps: If they are denied access, they can simply point users to
privacy panel of gnome-control-center since they can be sure location
access for the app can be enabled in there.
Also it's less annoying to user. Before this patch, if they denied
access to application, they had to keep doing that at least each time
they launched the application.
https://bugzilla.gnome.org/show_bug.cgi?id=762559
Alex told me that since it's not geoclue but rather GNOME-components
storing/accessing app permissions, it's better if we put it under
'gnome' rather than generic 'desktop' table.
Now that we no longer skip dimming/undimming windows while showing
the overview, we can still save a bit of work by changing the dimming
without animation while the window is hidden.
https://bugzilla.gnome.org/show_bug.cgi?id=762475
We skip window animations while the overview is shown (and the window
group is hidden) to avoid unnecessary work. However when an attached
modal dialog is opened or closed, this involves checking whether the
parent window should be dimmed - skipping that test means that we can
simply fail to dim or undim a window altogether, so do that check
unconditionally.
https://bugzilla.gnome.org/show_bug.cgi?id=762475
While we could have implemented this already a while ago, this would
have been a completely false security mechanism since we had no way of
reliably identifying applications. Since now with xdg-app, we can at least
reliably identify bundled applications, let's give users a choice of
which applications in particular they are OK with giving location data
to.
While we still can't reliably identify system (non-xdg-app) applications,
it seems extremely unlikely we'll ever be able to do that (at least not
in the near future) so we'll have to trust them to not lie about their
IDs.
Next release of geoclue will take the ID of bundled application directly
from corresponding xdg-app metadata so bundled applications can't simply
lie about their IDs.
https://bugzilla.gnome.org/show_bug.cgi?id=762119
This class will be responsible for authorizing applications that try to
access location information. Since this is mainly targetted for xdg-app
applications, we make use of xdg-app's D-Bus API to store
per-application authorization.
https://bugzilla.gnome.org/show_bug.cgi?id=762119
Add a dialog that is used in a following patch, to ask user if they want
a requesting application to gain access to their location.
Co-author: Florian Müllner <fmuellner@gnome.org>
https://bugzilla.gnome.org/show_bug.cgi?id=762119
Only recent IBus versions have support for this signal
which is used for wayland clients. In order to work
with older IBus versions we can silently ignore the
signal's absence.
https://bugzilla.gnome.org/show_bug.cgi?id=753476
We lost media controls outside of notification banners when
implementing the new notification designs. Reimplement this
functionality as a dedicated "Media" section in the message
list based on MPRIS.
https://bugzilla.gnome.org/show_bug.cgi?id=756491
Currently both the base classes for messages/sections and the message
list itself that instantiates the available sections are located in
the same module. As a result, it isn't possible to define sections
in a different module without introducing circular dependencies. The
Calendar module is already unwieldily large, so split it up a bit to
avoid it growing even bigger in the future.
https://bugzilla.gnome.org/show_bug.cgi?id=756491
It is not always possible to determine the type of audio device that
got plugged in. Add a system modal dialog to query the user in that
case and export in on the bus to gnome-settings-daemon.
https://bugzilla.gnome.org/show_bug.cgi?id=760284
IBus now provides a new method for cursor positioning where the
coordinates are relative to the focused window. This is useful for
wayland clients which don't have access to their global coordinates.
https://bugzilla.gnome.org/show_bug.cgi?id=753476
We are already emitting a 'drag-end' signal when no more dragging
is happening, so it makes sense to emit a 'drag-begin' too when
starting, so that apps interested in implementing different logic
between those two events can easily do it without needing to deal
with the underlying 'button-press-event' signal for the actor.
https://bugzilla.gnome.org/show_bug.cgi?id=761208
The Next and Sign In buttons are disabled when the username/password
field is empty. However, the user can still bypass this button by
pressing the enter key, leading to some odd glitches with the log in
for 'Not Listed?' users.
This is easy to fix by simply not progressing to the next screen when
the button is disabled.
https://bugzilla.gnome.org/show_bug.cgi?id=746180
Before reenabling all extensions, we update the list of enabled extensions
to catch any changes that happened while extensions were enabled. However
this is currently broken as onEnabledExtensionsChanged() is a nop while
disabled, so just call getEnabledExtensions() directly.
draggable.startDrag() is called directly here (i.e. manualMode is not set),
we must keep track of the touch event and pass it to startDrag() then.
https://bugzilla.gnome.org/show_bug.cgi?id=756748
We need to keep track of the pointer emulating touch sequence. In order
to have events properly redirected on touch devices, the
Clutter.grab_pointer and ungrab_pointer() have been replaced by the grab()
and grab_sequence() ClutterInputDevice methods, one or the other is used
depending on the device triggering DnD.
An extra "sequence" argument has been added to startDrag, passing null here
will resort to pointer grabs.
This is enough to make thumbnails in the WorkspaceBox draggable through
touch.
https://bugzilla.gnome.org/show_bug.cgi?id=756748
It overrides ::button-release-event in order to implement the
hidden/shown toggling, it must do the same on TOUCH_END, otherwise
menus stay shown on touch.
https://bugzilla.gnome.org/show_bug.cgi?id=756748
This works for pointers and touch on X11, there is however no pointer
emulation on evdev, so touch triggers ::clicked with button==0 which
is ignored.
https://bugzilla.gnome.org/show_bug.cgi?id=756748
Generally a user-changed operation will be uninteresting, but if the
user is currently in the user list and the account changes to locked, we
want to remove it from the list, or if the user is not in the list and
the account changed to unlocked, we want to add it to the list. This
fixes the case where a new user account created in gnome-control-center
does not appear in the user list. The password mode is set in the new
account immediately after it is created, but the operations are not
atomic, so the login dialog considers the new user account when it is
still locked and rejects it from being displayed, then immediately
afterwards the account is unlocked. This commit causes the login dialog
to show the account when this occurs.
The containsUser() check here is not strictly necessary, but reduces
spurious calls to addUser() and removeUser(), since there's no easy way
to check if the locked status of the account has changed (as it's much
easier to connect to one signal on the UserManager than to
notify::locked on each User object).
https://bugzilla.gnome.org/show_bug.cgi?id=758568
Animated backgrounds are based on a start time in local time - in case
of a timezone change, that time is no longer accurate. To fix, we need
to either make BGSlideShow aware of timezone changes (and notify us to
update the animation), or just reload the animation - timezone changes
should be a rare event, so go with the simpler second option.
https://bugzilla.gnome.org/show_bug.cgi?id=758939
LoginDialog has a private _user, but UserListItem has a public user.
Easy to get wrong since _user would be the right thing to type in 90% of
this file.
Any time estimates we can come up with are notoriously unreliable;
even on devices that report correct (dis)charging rates, any change
in workload, screen brightness etc. can throw our estimate off by
a huge amount. This is further compounded by bad firmware and battery
firmware which reports inaccurate data as neither Windows nor Android do
not use that data.
So instead, limit ourselves to only showing the current percentage
and leave its interpretation to the user.
As an added bonus, we end up with shorter strings that are less likely
to cause problems with ellipsization when translated.
https://bugzilla.gnome.org/show_bug.cgi?id=708472
Builtin chat and network notifications already follow the notification
policy of appropriate applications, it makes sense to do the same for
autorun notifications to give users control over hotplug notifications
in Settings.
If we detected that Bluetooth devices were setup, show the Bluetooth
menu so that users can easily turn Bluetooth back on.
This is a bit of a hack, as we cannot detect whether there is a
Bluetooth adapter at all when it's disabled, so we cannot tell whether
there were any Bluetooth devices setup, at some point. This state is
saved in the gnome-shell GSettings in the had-bluetooth-devices-setup
key.
Checking whether we saw Bluetooth devices at one point is a good
enough guess of whether there will be some in the future.
https://bugzilla.gnome.org/show_bug.cgi?id=723848
It's very unexpected that a spinner animation would
preempt idles from running.
This commit runs the spinner animation with a low
priority to ensure it doesn't take over the main
loop.
https://bugzilla.gnome.org/show_bug.cgi?id=754814
Right now the spinner animation updates every 14ms.
60 frames per second would be one frame per 16.667ms,
so we're waking up more frequently than we need to.
This commit changes the wakeup to happen after 16ms.
https://bugzilla.gnome.org/show_bug.cgi?id=754814
If the source actor is sized 0x0, the grabHelper will close the menu
on button release if the menu ends up flipped because in that case the
release event happens when the pointer is neither over the source
actor (since it's 0x0) or over the menu actor. A zero sized source
actor works for the non-flipped menu case because the menu's actor
itself ends up underneath the pointer.
https://bugzilla.gnome.org/show_bug.cgi?id=756605
If we get another effect on the same actor, we should make sure to
remove the clone through the "overwrite" methods provided by Tweener, or
there will be a race that might end up with a stray clone being left
around.
https://bugzilla.gnome.org/show_bug.cgi?id=756714
The translation should describe the difference between the fullscreened
and unfullscreened position of the window - however we are currently
assuming a fullscreen position of (0, 0) instead of the monitor's origin,
which causes glitches on dualscreen setups.
https://bugzilla.gnome.org/show_bug.cgi?id=756697
Some labels in the system status menu - namely network names - are out
of our control, and may thus grow the width "infinitively" unless we
restrict the menu width. So far we have been doing this by setting a
fixed width or max-width, but any value we put there might end up
being too restrictive in some locales. Instead, request a width that
fits all the labels we want to show unellipsized and use that instead
of an arbitrary limit.
https://bugzilla.gnome.org/show_bug.cgi?id=708472
We use the newly introduced feature from Mutter to hook up our own
fullscreen and unfullscreen animations.
To give the illusion of a transition as smooth as possible, we create a
snapshot of the current contents of the actor before its state is
changed, and crossfade between the two states while the size changes.
https://bugzilla.gnome.org/show_bug.cgi?id=707248
StIcon will skip loading the texture when its theme node is unset (which
may happen on style changes while the widget is hidden). While our size
request to compute the dash icon size will create the icon's theme node
if necessary (and of all its parents), a missing texture can still throw
off our computation.
Make sure this doesn't happen by ensuring the icon's style first, so the
texture is updated in response to StWidget::style-changed if necessary.
https://bugzilla.gnome.org/show_bug.cgi?id=745649
When adjusting dash icon sizes, we compute the icon padding by subtracting
the configured icon size from the first icon actor's preferred size. To
make sure that the preferred size correctly corresponds to the current
dash icon size even while the icon is animating, we enforce the size
before the size request. For that we used to temporarily manipulate
the icon texture size directly, but commit e92d204d42 cleaned this
up to use the setIconSize() method instead.
This does not work however, as the icon actor's iconSize property will
always match the dash iconSize property, making the method a noop. So
go back to the original approach of enforcing the texture size to make
sure we always base our computations on correct values.
https://bugzilla.gnome.org/show_bug.cgi?id=745649
There is nothing particularly critical about this notification, it
was only marked as such to get certain behavior like auto-expanding
and sticking-around to be acknowledged by the user (as it offers
more actions than the summary notification, so it is frustrating
when it goes away because it was missed).
As all notifications will now stay visible until we are sure the
users has seen them, the latter reasoning no longer applies.
Auto-expansion doesn't appear too important and may even be considered
annoying by users, so remove the CRITICAL hint now.
https://bugzilla.gnome.org/show_bug.cgi?id=657923
We are currently erroring out when the tab chain doesn't contain at
least one window for an app which might happen for windows that don't
take focus like xeyes. This leaves us in a state where we can't show
the switcher at all. Let's just ignore these apps instead of looking
broken.
While the GtkSettings::gtk-shell-shows-app-menu property is meant to
reflect a desktop capability (i.e. in the GNOME case: the app menu is
shown in the top bar), it is possible for users to overwrite it.
Respect the setting and actually hide the menu in that case.
https://bugzilla.gnome.org/show_bug.cgi?id=745919
Refer to the system menu in the top bar as "System" rather than "Settings" as
it contains more than just settings and "Settings" is already used for the
settings panel. "System" is also used elsewhere, so include context for
translators.
The destroy signal handler is kept connected despite the NotificationMessage
being destroyed, which leaves dangling NotificationMessage objects that will
be mass destroyed when the Notification object these depend upon is finally
destroyed.
Depending on the amount of accumulated NotificationMessages, this may lead
to temporary freezes or other more funky issues when recursion limits are
hit.
https://bugzilla.gnome.org/show_bug.cgi?id=755425
When loading several animations at the same time, the last call
overrides the result for all of them.
This commit caches all animations separately based on the source's
schemas.
https://bugzilla.gnome.org/show_bug.cgi?id=741453
We currently will always allocate the user list's preferred size, so it
will grow indefinitely and never scroll; limit the height instead to
get the desired scrolling behavior when necessary.
https://bugzilla.gnome.org/show_bug.cgi?id=754525
When the user successfully types their password, we should hide
the spinner from the button well right away, so it doesn't
consume resources until reset (which may happen significantly later
if the user is vt switched away)
https://bugzilla.gnome.org/show_bug.cgi?id=753891
The code previously tried to stop spinner after it was hidden, but
due to an incorrect check was only stoppig it after it was shown.
Also, it was only stopping after hiding due to an animation, and
failing to stop it in the non-animated case.
This left the spinner hidden and running while VT switched away
from the login screen, only stopping when the auth prompt was
reset when switching back.
https://bugzilla.gnome.org/show_bug.cgi?id=753891
* switch to a one-column layout (and adjust strings/widths
accordingly
* remove separator before system menu
* add link to account settings to user submenu for consistency
https://bugzilla.gnome.org/show_bug.cgi?id=751377
Since commit 79c04c93e4, we launch Polari instead of Empathy when
activating a chat notification for an IRC channel. It therefore makes
sense to follow Polari's notification policy for those notifications
rather than Empathy's.
https://bugzilla.gnome.org/show_bug.cgi?id=752881
We only need the user verifier for the purpose of user verification.
Once it's complete we should clear it so it doesn't get in the way
later.
This fixes a bug introduced in commit 3c8c5a5570 that leads to the
user session crashing when the login screen is reactivated.
https://bugzilla.gnome.org/show_bug.cgi?id=753181
We fade out the authentication prompt when a user successfully
logs into a user session. We reset it and fade it back in when
the user switches back to the login screen VT.
The problem is, we only fade it back in if the auth prompt status is
VERIFICATION_SUCCEEDED. It's possible for it to be NOT_VERIFYING
if the authprompt gets reset for some other reason in the interim.
This commit changes the check to be more precise. We now only skip
the fade-in, if we're already faded in, and we only skip the reset if
we're already reset.
https://bugzilla.gnome.org/show_bug.cgi?id=753181
Follow the design we have in gtk+ for buttons dialogs,
which are at the bottom and they expand full width, having
the same amount of space for each one.
Also, since this removes any space for non-button widgets
in the button area, move the spinner present in the auth prompt
dialog next to the password entry.
https://bugzilla.gnome.org/show_bug.cgi?id=746108
It may be 2015, but users still stumble upon the occasional .desktop
file that uses a filename encoding other than UTF-8. We currently
fail quite spectacularly in that case by not displaying any apps at
all - handle this case more gracefully, by only filtering out the
offending apps.
https://bugzilla.gnome.org/show_bug.cgi?id=651503
If there's a caret or focus move we should delay it until the pointer
is stationary for a little while so as to avoid jittery and spurious
viewport movements.
https://bugzilla.gnome.org/show_bug.cgi?id=752138
The user should be allowed to cancel if verification hasn't
started yet and they're typing in their username. This
commit changes the authPrompt cancel function to not
ignore such requests.
https://bugzilla.gnome.org/show_bug.cgi?id=752739
Normally the user isn't allowed to proceed passed
the username question until they've filled it in.
To ensure this, the authprompt code desensitizes
the next button when the number of characters change to
zero.
Unfortunately it fails to desensitize the next button
up front when the entry starts out empty.
This commit addresses that bug.
https://bugzilla.gnome.org/show_bug.cgi?id=752739
If the next button ever gets set to Sign In, it won't
get reset to next until the next question asked by pam.
This commit ensures it gets reset to Next when asking
for the username.
https://bugzilla.gnome.org/show_bug.cgi?id=752739
This object (not really a Clutter.GestureAction) sets up a captured-event
handler, which exclusively looks for 4 finger touchpad swipes, emitting
an ::activated signal under the same terms than WorkspaceSwitchAction.
https://bugzilla.gnome.org/show_bug.cgi?id=752250
We currently only cancel the user verifier on reset if
verifying, but that means we don't properly cancel it when
asking for a username at the Not Listed screen.
The object already handles getting called when there is
nothing to cancel, so just cancel it unconditionally.
https://bugzilla.gnome.org/show_bug.cgi?id=752438
shell_global_get_overrides_settings() may return %NULL in case of
custom shell modes (i.e. not the default and classic ones); while
this is not officially encouraged, we should still handle it rather
than throw an error.
https://bugzilla.gnome.org/show_bug.cgi?id=751921
The control center will call this method when the configuration dialog
for a display opens/closes, which will cause the same labels to quickly
fade out and in again, looking like it's flickering.
This commit fixes the issue by removing the tweens altogether.
https://bugzilla.gnome.org/show_bug.cgi?id=751599
In some cases we might be allocated a size such that
this._grid.topPadding and this._grid.bottomPadding are both 0 which
means that the ScrollView fade effect gets removed. In that case don't
try to access the effect since it will be NULL.
https://bugzilla.gnome.org/show_bug.cgi?id=750714
The menu items to move a window to the left/right workspaces were
removed when the window menu was implemented in GNOME Shell. This
is OK for the default vertical layout but not for alternatives.
https://bugzilla.gnome.org/show_bug.cgi?id=751344
And make these only handled on wayland. There's a plethora of issues
around touch passive grab and touch/pointer doubly handling to use
these right away on X11, so we stick to single-touch/pointer there.
This reverts commit 032a688a72.
https://bugzilla.gnome.org/show_bug.cgi?id=750287
Instead of using gnome-settings-daemon's D-Bus interface's presence.
iio-sensor-proxy now offers a D-Bus interface, which will exported
"HasAccelerometer = true" when an accelerometer is present.
https://bugzilla.gnome.org/show_bug.cgi?id=749671
Just reuse this gesture rather than implementing edge detection ourselves.
As a plus, we might get touchpad swipe support when Clutter handles it.
https://bugzilla.gnome.org/show_bug.cgi?id=749742
The menu is clearly associated with a particular window, so keeping
it around when the window is gone doesn't make sense - in case of
the window menu, it is actually harmful as every action will act on
the invalidated window and result in a crash. So just dismiss the
menu when the menu is unmanaged.
https://bugzilla.gnome.org/show_bug.cgi?id=749529
When chrome is added with the trackFullscreen parameter, the actor's
visibility will be updated automatically whenever its monitor's
fullscreen state changes. However as we currently ignore the fullscreen
state at the time the chrome is added, the initial visibility may well
be incorrect - fix this by updating the initial visibility as necessary.
https://bugzilla.gnome.org/show_bug.cgi?id=749383
Since the introduction of per-source notification policy in commit
098bd4509b, the NotificationPolicy::enable-changed signal has been
used to track the 'enable' setting. However as we never actually
emitted that signal, this never worked without a restart - oops.
https://bugzilla.gnome.org/show_bug.cgi?id=749279
If we aren't the active session clutter can't animate and thus we
can't expect the shield to be shown before releasing the suspend
inhibitor so we should release it immediately when becoming inactive.
https://bugzilla.gnome.org/show_bug.cgi?id=749228
The whole point of holding a suspend inhibitor is to be able to lock
before suspending.
Currently, when resuming we immediately take the inhibitor without
checking that we're locked which means that we won't be able to
release this inhibitor if we don't unlock at least once.
To prevent that and to better match the inhibitor's intention in the
first place, we can tie the inhibitor with not being locked. In
practice, we also want to let the locking animation finish before
suspending, so we'll tie the inhibitor with not being active
instead.
https://bugzilla.gnome.org/show_bug.cgi?id=749228
This could happen if we are VT switched away and an animated
activation is requested because we're preparing to enter sleep. Since
we don't animate in this case we'd never reach
_completeLockScreenShown() before coming out of sleep, at which point
we _inhibitSuspend() again and would leak the previous inhibitor.
https://bugzilla.gnome.org/show_bug.cgi?id=749228
Commit 08690d658f generalized the banner-blocking behavior of the
dateMenu to all menus that would obscure the banner. However setting
up the 'open-state-changed' handler only when an indicator is added
does not work for indicators that change their entire menu (like the
app menu) - we currently end up with menus with no connected signal
handler, and throw an error when trying to disconnect an invalid
signal ID.
To address this, add a new PanelButton::menu-set signal and use that
to set up the 'open-state-changed' handler.
https://bugzilla.gnome.org/show_bug.cgi?id=745910
For barriers like the hot corner which are made up of multiple axis
barriers, make sure that all the barriers have been left before
resetting the barrier.
We currently block banners while the time+date menu is open, as it
would obscure the notification. However it is not necessarily the
only menu for which this is the case, so generalize the behavior
to all menus that would overlap banners when open.
https://bugzilla.gnome.org/show_bug.cgi?id=745910
As notifications appear in the time+date dropdown's message list, there's
a strong relationship between notification banners and the menu. However
while the time+date menu is centered by default, which matches the banner
position, its actual position depends on the session mode - in particular
it is moved to the right in classic mode.
Reinforce the relationship in these cases by moving notification banners
underneath the time+date menu.
https://bugzilla.gnome.org/show_bug.cgi?id=745910
According to systemd logind's documentation, the CanSuspend() method
"returns 'na' in case "the operation is not available because hardware,
kernel or drivers do not support it", while "'no' is returned if the
operation is available but the user is not allowed to execute it".
See http://www.freedesktop.org/wiki/Software/systemd/logind
Thus, we need to return true here when the reply for the CanSuspend
method is neither 'no' nor 'na', or we would providing false positives
in cases where suspension is simply unsupported.
https://bugzilla.gnome.org/show_bug.cgi?id=748338
