Do not overflow currentItems array. If the Menu section is filled
via model items-changed callback the position in the model passed to
the RemoteMenu _modelChanged can be a to be added asynchronously
action-added. Thus the item does not yet exists in the currentItems.
https://bugzilla.gnome.org/show_bug.cgi?id=676447
_startTimer adds a tweener to implement the description countdown, which
updates the entire content on each iteration, including the icon. This
causes a significant impact on performance, especially when accessibility
is enabled, as it causes a flood of AtkObject:state-change:showing events.
As the countdown only affects the description, factor out _updateDescription
and use it in _startTimer, and only do a full update of all contents when
necessary.
https://bugzilla.gnome.org/show_bug.cgi?id=674210
When displaying children, we need to make sure that we use the rowLimit
property that we pass to iconGrid, rather than assuming that it's
always MAX_SEARCH_RESULTS_ROWS in case some subclass (in an extension maybe)
wants to do something different.
https://bugzilla.gnome.org/show_bug.cgi?id=675527
Depending on the number of accounts, the type or simply the network,
there may be a noticable lag between setting the status and the actual
status change.
Use the new user-status-pending icon to indicate progress.
https://bugzilla.gnome.org/show_bug.cgi?id=659067
Refactor NMDeviceVPN to be more like the other NMDevices, including
having a valid getSectionTitle() and emitting signals when the
underlying connection changes state.
Use the existing notification infrastructure to hook these signals
to actual notifications (including some code consolidation).
https://bugzilla.gnome.org/show_bug.cgi?id=676330
Currently we only connect to the 'notify::n-workspaces' signal the
first time the overview is shown, which means we will miss any
changes to the workspace layout in the meanwhile.
In particular, the decision of whether the workspace switcher should be
shown is taken before the dynamic workspace handling takes over, and is
thus based entirely on the value of the num-workspaces user preference
rather than the actual number of workspaces.
Just connect the signal in _init() (with the nice side-effect to make it
explicit that the signal handler won't ever be disconnected).
https://bugzilla.gnome.org/show_bug.cgi?id=673198
role/label_actor should be used for the actor that will receive
the focus. In some cases it was also (wrongly) set on the
container, so using an AT like Orca, it exposed both.
https://bugzilla.gnome.org/show_bug.cgi?id=672242
It's used right away to discard some Empathy notifications.
This regression has been introduced during the 3.4 cycle when 'hints' has been
turned to a GVariant.
https://bugzilla.gnome.org/show_bug.cgi?id=675370
Ensure that the UI is updated when a connection changes name or id,
even if it was already known by a device.
Also, use less private properties on NMConnection objects, as they
can become stale and cause problems.
https://bugzilla.gnome.org/show_bug.cgi?id=677097
We now drop all status icons that are not explicitly enabled, which
breaks the ibus icon. Add it to the list of allowed icons until we
merge it with the keyboard one.
https://bugzilla.gnome.org/show_bug.cgi?id=677058
These methods were initially introduced when I was planning on having
an explicit DisableExtension/EnableExtension, instead of hooking up
a gsettings notify. This behavior was changed at the last minute, but
the methods were kept to avoid having to change the browser-plugin.
Consumers of this API should just set the GSettings key directly
instead now.
https://bugzilla.gnome.org/show_bug.cgi?id=676837
In Shell.SessionType.USER mode, two separate setup functions were
used during startup. With the new feature-based checks, the second
one is now almost empty, so move its remaining code into the first
function and remove it.
https://bugzilla.gnome.org/show_bug.cgi?id=676156
Add a sessionMode.allowKeybindingsWhenModal property, which determines
whether keybindings should still be handled while a modal dialog is
up or not.
https://bugzilla.gnome.org/show_bug.cgi?id=676156
Instead of falling back to a set of default values or crashing the
window manager when an invalid mode is specified, check the value
of the ShellGlobal:session-mode property before taking over as WM
and make a clean exit if it cannot be resolved to an existent mode.
https://bugzilla.gnome.org/show_bug.cgi?id=676156
Rather than accessing global.session_type / global.session_mode
all over the place, delegate mode information to a dedicated
sessionMode object. While not very useful for now, we will replace
checks for a particular mode with checks for particular properties
that sessionMode defines based on global.session_mode.
https://bugzilla.gnome.org/show_bug.cgi?id=676156
Since commit 518282e169, we hide both "Switch User" and "Log out"
on single-user systems. However, if there is more than one session
available, users may still want to get back to the login manager
to change sessions.
Add both "Log out" and "Switch Session" items in that case.
https://bugzilla.gnome.org/show_bug.cgi?id=675802
Bluetooth PINs are required to have 6 digits, so enforce that
condition by making the PIN request notification's confirm
button insensitive unless the entered PIN has the correct length.
https://bugzilla.gnome.org/show_bug.cgi?id=651251
The availability of a notification action may depend on conditions,
so add a method to control the sensitivity of buttons which have
been added with addButton().
https://bugzilla.gnome.org/show_bug.cgi?id=651251
When the appMenu is not available, for instance when no windows are
open (on the current workspace), we make its actor unreactive to
"hide" it from keynav. However the menu can still be triggered
erroneously when using the corresponding keyboard shortcut, so
add a check for the actor's reactivity there as well.
https://bugzilla.gnome.org/show_bug.cgi?id=676316
For most subclasses, this is a direct swap -- a lot of the time, the
constructor was a blank class that override createNotificationIcon,
and called _setSummaryIcon in _init.
https://bugzilla.gnome.org/show_bug.cgi?id=661236
Rather than ask most users of Source to subclass it to simply set their icon,
just allow them to create a new instance and add it without any complex magic.
https://bugzilla.gnome.org/show_bug.cgi?id=661236
Technically those are minor changes, but people will love us anyway:
- change the default of the <alt>ernative to "Power Off"
- remove "Online Accounts" item
- regroup the remaining items
- remove ellipses from labels
https://bugzilla.gnome.org/show_bug.cgi?id=675802
Now that all searches are async we can remove the code path for the
SearchSystem::search-completed signal which is no longer useful.
This patch ends up fixing the status text not being updated for when
there are no results.
https://bugzilla.gnome.org/show_bug.cgi?id=675328
As shown in the previous commits, synchronous search is easily implemented
by the asynchronous search API. The only reason we still have a
synchronous search API is of historical reasons. Well, we're not a museum,
and git log can keep our fossils safe if need be....
https://bugzilla.gnome.org/show_bug.cgi?id=675328
To allow this to happen, we need to make sure that we don't overwrite the
previousResults when calling the async method. Note that this is a bug of
some sort, we were already using this synchronous style when a remote
search failed.
https://bugzilla.gnome.org/show_bug.cgi?id=675328
On the code two labels are created. One is used on the date menu
itself, and the other for the menu icon at the top panel. The wrong
label was used as the label_actor for the top panel menu icon.
https://bugzilla.gnome.org/show_bug.cgi?id=675307
Pausing means that we will continue to use the same output file when
the keybinding is activated again. While useful to record a single
video in chunks, it doesn't seem to be how most users understand the
keybinding. Closing the recorder will close the file and create a new
one the next time the keybinding is pressed.
https://bugzilla.gnome.org/show_bug.cgi?id=675128
Two nested scroll views were fighing with each other. The reason isn't
particularly important and has to do with some silliness involving
StAdjustment. The visible effect was that scrolling up and down when
in a summary item view would appear to be glitchy, and sometimes not
work at all.
To fix, make sure that the scroll view we don't care about is disabled
when in a summary mode.
https://bugzilla.gnome.org/show_bug.cgi?id=661615
There have been multiple notifications ever since we had a notification stack
per source, so the idea of one notification being on screen at a time has long
been dead.
https://bugzilla.gnome.org/show_bug.cgi?id=661615
We seem to have a lot of code that does something along the lines of:
if (condition)
actor.show();
else
actor.hide();
ClutterActor already has such a thing for exactly this purpose: the 'visible'
property. Use it instead of the mess above.
https://bugzilla.gnome.org/show_bug.cgi?id=672272
We hide the content around displaying new search results to prevent
flickering, unfortunately, one side effect of hiding an actor is
losing key focus if it currently is on the that actor or any
child. This could happen in the case of async results showing up after
the user had moved focus to the search results.
This patch works around that issue by saving the key focus and
resetting it back after displaying the new async results.
https://bugzilla.gnome.org/show_bug.cgi?id=675078
We already have one too many logging systems. Remove the errors tab
and make global.log/global.logError point to window.log/window.logError
instead.
https://bugzilla.gnome.org/show_bug.cgi?id=675104
The keybinding to toggle the screen recorder was implemented as a
signal on MetaScreen, as keybindings could only be defined in mutter
core. As this is no longer the case, we can move the binding into the
shell where it belongs.
https://bugzilla.gnome.org/show_bug.cgi?id=674377
When receiving another message or responding in a new expanded chat
notification that has no prior chat history, the notification moved down
below the edge of the screen instead of expanding up, making part of it
invisible. Avoid this by making sure the notification's position is updated.
https://bugzilla.gnome.org/show_bug.cgi?id=661944
A BindConstraint on the size of uiGroup forces full redraws of the scene.
Instead, implement and use get_preferred_width and get_preferred_height.
https://bugzilla.gnome.org/show_bug.cgi?id=670636
Commit 26580f8f reintroduced an optimization on style changes to avoid
creating icons unconditionally. As this breaks icon theme changes (for
instance when toggling "High Contrast" in the universal access menu),
remove it again.
https://bugzilla.gnome.org/show_bug.cgi?id=672941
nm_active_connection_get_devices() has a (questionable) special case
for the no devices case (which happens if the DBus object is
destroyed because NM went down): it returns null instead of an empty
array. Handle that instead of crashing.
https://bugzilla.gnome.org/show_bug.cgi?id=673043
With the application menu now being more than a stub, it has
become a much more interesting target, so add a keyboard shortcut
to open it directly.
This should also ease some of the pain for focus-follows-mouse users.
https://bugzilla.gnome.org/show_bug.cgi?id=672909
StBoxLayout currently does not handle height-for-width children
correctly under some circumstances. As a work-around, hard-code
a label height of two lines of text, which should work for most
locales in the one place the widget is currently used.
https://bugzilla.gnome.org/show_bug.cgi?id=672543
We currently require users to tab away from the search entry before
search results can be navigated using arrow keys. For convenience,
support using arrow keys directly from the entry.
https://bugzilla.gnome.org/show_bug.cgi?id=663901
To avoid messing up St.Buttons' internal state with a pointer grab,
we wait for the pointer to leave the actor before starting the
drag operation manually. This works generally fine, but makes starting
a drag operation harder than necessary. To fix, enforce a reasonable
button state when starting the drag, rather than special-casing buttons
before the drag.
https://bugzilla.gnome.org/show_bug.cgi?id=637103
Currently, click and drop events are handled by each WorkspaceThumbnail
instance. With the introduction of the workspace cut and the request
to extend the reactive area of the workspace selector to the edge
of the monitor, it becomes more convenient to do all the event handling
inside ThumbnailsBox, even if this requires some manual layout computation.
https://bugzilla.gnome.org/show_bug.cgi?id=643319
Two small fixes which made _showNewStyleDialog() err out:
- g_key_file_load_from_data() expects a string as first
argument, but g_buffered_input_stream_peek_buffer()
returns an array of "data"
- g_key_file_load_from_data() is documented to allow -1 as
length parameter for \0-terminated strings, but the actual
type of the parameter is unsigned (d'uh)
https://bugzilla.gnome.org/show_bug.cgi?id=671556
Tweener uses a clutter timeline to manage all active animations
running at a given moment. The timeline is mopped up when no
animations are going any more.
Clutter requires timelines to have a finite duration, but since
animations can happen at any moment, no fixed duration can
accomodate the shell's needs.
To combat this problem, the tweener code picks a relatively
long duration: 1000 seconds. No string of animations should take
that long, so, in theory, that should be good enough.
Unfortunately, this tactic fails, in practice, when the user
suspends their machine, or VT switches. An animation can take
much longer than 1000 seconds (~16 minutes) to complete in those
cases. When the user resumes, or VT switches back the timeline
completes immediately (since it's already late) and tweener
never notices that the timeline stops ticking.
This commit changes the tweener timeline to automatically loop
back to 0 after completing, so that despite its fixed duration
property, it effectively never stops. Since the timeline loops,
its concept of elapsed time no longer increases monotonically,
so we now ignore it and track time ourselves with
GLib.get_monotonic_time().
This partially reverts commit
35764fa09e.
https://bugzilla.gnome.org/show_bug.cgi?id=653833
Some objects have a resolve hooks that throw exceptions, so just
checking "'actor' in object" can fail. In that case we should catch
the exception and return the standard toString() value, or the
object cannot be inspected from the looking glass.
https://bugzilla.gnome.org/show_bug.cgi?id=671410
We currently only update the status chooser's sensitivity if accounts
are added, removed or enabled; unfortunately during account creation,
the account may become enabled before it is actually valid, so the
status chooser remains insensitive. Fix by listening to validity changes
as well.
https://bugzilla.gnome.org/show_bug.cgi?id=672265
Instead of duplicating the vendor prefix search in the endSessionDialog code,
just use lookup_heuristic_basename, which is used with real app tracking.
https://bugzilla.gnome.org/show_bug.cgi?id=672270
gnome-session moved away from using properties over DBus in 2008, which
means that the code in GNOME 3.0 never should have worked -- but it did,
which makes me suspect that it was a quirk of the GJS DBus implementation.
Switch over to the proper inhibitor API, which is based on methods. If
gnome-session eventually gets ported to GDBus, then we can switch back
to properties.
https://bugzilla.gnome.org/show_bug.cgi?id=672270
Bailing out of _sync() early if the application lost keyboard focus to
the shell can only be done on actual application focus changes. In
particular, doing this check on a switch to an empty workspace while
the keyboard focus is already on the shell prevents the AppMenuButton
from being hidden as it should.
https://bugzilla.gnome.org/show_bug.cgi?id=672011
Reactive means that the actor is reachable from keyboard
navigation. If the target isn't current that means we are not tweening
the actor to be visible so we shouldn't set it reactive either.
https://bugzilla.gnome.org/show_bug.cgi?id=671998
If the user has their mouse over the workspace thumbnails while
entering the overview, it's more likely that it's a coincidence
that their mouse pointer is in the area. Avoid expanding the
thumbnails box in that case.
https://bugzilla.gnome.org/show_bug.cgi?id=651092
In the workspace-collecting code we add a check to avoid collecting a
workspace if any startup sequence is running there. Since the sequence
can take some time to load, an helper function is also added which keeps
the (empty) workspace around for a very short time, while waiting for the
sequence to start.
https://bugzilla.gnome.org/show_bug.cgi?id=664202
If the user was inactive while a notification was shown, we show the summary
when the user becomes active again. This ensures that we inform the user of
the existance of new notifications that the user might have missed.
When the user comes back from away, the summary is now only shown if it has
new notifications.
https://bugzilla.gnome.org/show_bug.cgi?id=643014
The onscreen keyboard should not follow the locale's text direction,
but order keys according to the selected keyboard layout. Effectively
this means enforcing LTR on the keyboard actor.
https://bugzilla.gnome.org/show_bug.cgi?id=672024
We are currently taking "old" placeholders that are still animating
out into account to calculate the new placeholder position - this
causes an annoying bug, where dragging a dash item downwards triggers
quick continous position changes of the placeholder.
Just ignoring old placeholders fixes the issue.
https://bugzilla.gnome.org/show_bug.cgi?id=651842
Some modifiers like NumLock or ScrollLock don't make sense in
keybindings, which is why we ignore them in mutter when matching
events to keybindings; for keybindings in the overview, we do
the matching ourselves, so filter the same modifiers as mutter.
https://bugzilla.gnome.org/show_bug.cgi?id=665215
The hide animation causes hover notifications for the actors inside the
boxpointer. PopupBaseMenuItems, in particular, grab the keyboard focus on
hover notifications to enable keyboard navigation on menus. This, in turn,
breaks modal dialogs' keyboard navigation since key focus is taken away from a
just created dialog when the menu is hiding.
Since input events aren't useful while menus are animating we just prevent
them from propagating.
https://bugzilla.gnome.org/show_bug.cgi?id=662493
Checking if _buttonLayout contains _initialKeyFocus always fails since we
destroy all children before. Instead, use a signal handler id when explicitly
setting the initial key focus which is zeroed if/when the actor is destroyed.
https://bugzilla.gnome.org/show_bug.cgi?id=663437
The dynamic-workspaces key was introduced to allow us to opt out of
writing the num-workspaces setting (which is ignored with the dynamic
workspace management anyway), but there'll be some expectations that
the setting will have an effect on the UI.
It's actually not very hard to support, so here's to the graybeards ...
https://bugzilla.gnome.org/show_bug.cgi?id=671568
With the recent keynav changes, the keyboard focus can now move
away from the search entry while a search is active. While we
keep the focus entry style while a search is active, we set the
cursor visibility depending on whether the entry has focus. This
doesn't seem very logical, so always request to show the cursor
when we appear focused.
Note that at least for now we are just expressing intent, as clutter
never draws the cursor for unfocused entries.
When canceling a search pressing Escape while the focus is on the
search entry we clear the entry, set its text to the hint and go back
to the previously selected tab. Make this the behavior also for when
the focus is on search results and not on the entry itself.
https://bugzilla.gnome.org/show_bug.cgi?id=663901
Running apps are always kept in the dash, so removing them from
favorites just moves them to the end of the favorites list. This
behavior is not immediately obvious, so only show the remove target
when dragging a favorites application that is not currently running.
https://bugzilla.gnome.org/show_bug.cgi?id=644853
Saving the status to GSettings is pointless if it did not actually
change. If done during login, it is actually harmful, as it causes
dconf-service to be started.
https://bugzilla.gnome.org/show_bug.cgi?id=668214
When restoring the previous sesssion presence, we forcefully set
gnome-session's status. In the case of IDLE, this will trigger the
screensaver, which is clearly unwanted first thing after login. We
should only save and restore statuses that are explicitly set by the
user anyway, so limit presence saving to AVAILABLE and BUSY statuses.
https://bugzilla.gnome.org/show_bug.cgi?id=665701
Previously, PanelMenuButton would only set max width if the user
explicitly clicked the menu button, resulting in submenus without scrollbars
if opened via keyboard navigation or mouse over.
https://bugzilla.gnome.org/show_bug.cgi?id=658946
loadExtension() fails if the extension object is already created,
but the installation dialog was creating a dummy object in the
downloading state. Since nothing requires that (and the object is
not in the correct format anyway), just kill it.
https://bugzilla.gnome.org/show_bug.cgi?id=671134
This hack was part of the custom scroll view code that allowed for
proper scrolling when the actor was near the screen edges. Since
the port to St.ScrollView, it's unnecessary and downright wrong,
causing portions of actors to be clipped. Remove it.
https://bugzilla.gnome.org/show_bug.cgi?id=613194
If a widget isn't focusable or none of its children are focusable, then
navigate_focus will return false and the key focus won't be set. We
need to explicitly grab the key focus in this case.
https://bugzilla.gnome.org/show_bug.cgi?id=671001
* Add a keyring prompter based on GcrSystemPrompter
* Adds dependency on gcr version 3.3.5 or higher
* Not yet using unmerged support for non-pageable memory
https://bugzilla.gnome.org/show_bug.cgi?id=652459
The preferred way to unmaximize/untile a window is by using a drag
gesture. Extend the available area to start this gesture into
non-reactive parts of the top bar above the window - with that we
take advantage of the "infinite height" of the screen edge, and the
extra space is particularly useful when the window has its titlebar
hidden.
https://bugzilla.gnome.org/show_bug.cgi?id=666359
We were supposed to be updating the notification's title when the
window title changes, but we didn't actually bother to re-format
the title and body, effectively leaving the notification unchanged.
For modal dialogs without buttons, the button group still contributes
padding/spacing. To fix that, hide it by default and only show it
when actually adding buttons.
https://bugzilla.gnome.org/show_bug.cgi?id=668209
The appSwitcher has been using a custom scrolling implementation because
St.ScrollView was buggy when it was written. The bugs have been fixed
so remove the custom implementation and move to St.ScrollView.
https://bugzilla.gnome.org/show_bug.cgi?id=613194
The old formula worked only when the primary monitor was positioned at the
top of the virtual desktop. When that was not the case, the available
space was miscalculated sometimes resulting in negative numbers, which in
the end produced strangely vertically stretched window thumbnails.
https://bugzilla.gnome.org/show_bug.cgi?id=651130
Although not all "Finding and reminding" applications are ready
yet, the integration with gnome-documents' search results overlaps
enough with the "Recent Items" provider to justify its removal.
https://bugzilla.gnome.org/show_bug.cgi?id=670150
Allow applications to register search providers by dropping a keyfile
into a well-known directory. For now, initialize all found providers;
long term, we probably want to give users the ability to restrict the
set of active search providers.
https://bugzilla.gnome.org/show_bug.cgi?id=663125
Add an asynchronous search provider for results from a DBus service
implementing the org.gnome.Shell.SearchProvider interface; this
will allow applications to hook into the Shell's search without
implementing it in Shell itself or requiring an extension.
https://bugzilla.gnome.org/show_bug.cgi?id=663125
We will allow applications to hook into shell's search by registering
a service which implements a well-known DBus interface.
"search-providers" is a reasonable directory name for applications to
drop their registration files, but it conflicts with "search_providers"
used by open search providers - rename the latter to avoid confusion.
https://bugzilla.gnome.org/show_bug.cgi?id=663125
Currently, asynchronous search providers are expected to call
startAsync() in getInitialResultSet()/getSubsearchResultSet(),
which will trigger async mode until the search is canceled or
updated. Switching between synchronous and asynchronous mode like
this makes asynchronous search an implementation detail, but being
transparent to the searchDisplay means that certain optimizations
don't work as expected. Namely, updating asynchronous search results
causes flickering, and the automatic selection never focuses
asynchronous results.
So change the API to require providers being either synchronous (with
the current getInitialResultSet()/getSubsearchResultSet() methods)
or asynchronous (with asynchronous variants), and handle asynchronous
providers explicitly in searchDisplay.
https://bugzilla.gnome.org/show_bug.cgi?id=663125
renderResults() updates the results set, determines the number of
results to display, retrieves the corresponding result metas and
adds a new results actor for each meta.
Splitting the function in those parts allows to move the retrieval
of the result metas into SearchResults, which is where we ensure
flicker-free rendering and control the selection - we want to keep
both features for asynchronous result metas which we are about to
introduce.
https://bugzilla.gnome.org/show_bug.cgi?id=663125
Empathy uses to support 2 D-Bus API for calls:
- StreamedMedia: legacy API
- Call.DRAFT: experimental version of the new API
Since 3.3.90, Empathy only supports Call1, the first stable version of the new
API, so the Shell should do the same.
https://bugzilla.gnome.org/show_bug.cgi?id=667694
Add a new dbus method that takes an area (x, y, width, height) and fires a
flashspot on it.
This would be useful for applications like totem and cheese.
https://bugzilla.gnome.org/show_bug.cgi?id=669660
An actor is removed from its parent after it emits the destroy signal,
so we can't just check if the notification stack has more than one
notification -- we need to check if there's a notification there
that is not the current one.
This was causing spew in the form of:
"this.notificationStack.get_children()[0]._delegate.setIconVisible
is not a function"
IconGrid items used to be square, so a single size value made
perfect sense. However, as contact search uses rectangular items,
using a single size is wrong - the allocated height ends up twice
the size of the visible height, which is particularly visible if
another provider displays results below contact results.
https://bugzilla.gnome.org/show_bug.cgi?id=670148
The correct way to make an actor having the same size as another is
a ClutterBindConstraint. Connecting to 'allocation-changed' fails because
the allocation might not change even when 'width' and 'height' properties do.
This is the case of Main.uiGroup, used as parent container for zoomed
window clones.
In lightbox.js we bind also the position because in principle it could change,
even if currently only fullscreen lightboxes are used.
VPN secrets are stored by the plugins, that provide separate
helpers for authentication. This commit adds the support for invoking
the binaries and pass them connection details.
For plugins that support it (as exposed by their keyfile), we invoke
them in "external-ui-mode" and expect a set of metadata about the
secrets which is used to build a shell styled dialog.
https://bugzilla.gnome.org/show_bug.cgi?id=658484
ConsoleKit is being obsoleted by systemd. Accordingly port the CK logic
in the gnome-shell automount manager to systemd-logind APIs.
This makes use of systemd-logind's native C APIs which are much easier
to use than the D-Bus APIs in this case, and much faster too (since they
are synchronous and directly query the kernel for the information we
need). The dependency is compile time optional, and in order to be nice
to the Debian folks g-s compiled with this enabled fill automatically
fall back to CK support on systems lacking systemd.
Currently they return 'undefined' instead of something meaningful,
e.g. DND.DragMotionResult.CONTINUE. This was unnoticed because none
of the ancestors of the Activities button actors do any drag handling.
The only visible issue are JS errors generated when dragging, for example,
a window thumbnail over the button, because the cursor cannot be set.
https://bugzilla.gnome.org/show_bug.cgi?id=669921
Since the dummy actor occupies exactly the same area of the Hot Corner,
it can be erroneously picked during xdnd operations. Fix this by
hiding it from pick.
https://bugzilla.gnome.org/show_bug.cgi?id=669831
