The rewrite of Mutter's background code (see bug 735637) requires
corresponding changes here - we no longer need to layer multiple
MetaBackgroundActors together.
The general strategy is that a BackgroundSource object is created
per GSettings schema, and keeps either one Background/MetaBackground pair,
or, for animation, a Background/Metabackground pair for each monitor.
https://bugzilla.gnome.org/show_bug.cgi?id=735638
Following design decision, we want to animate AllView and FrequentView
when opening and closing with a swarm spring form.
This involves a few changes needed to allow that, since from some time
now, we are animating page changes in viewSelector, using only a fade
transition. However now we want to let appDisplay and iconGrid apply its
own animation.
For that we special case the change to and from apps page on
viewSelector to let appDisplay to animate its own items, using and API
on appDisplay which at the same time uses an API on iconGrid.
Thanks Florian Müllner for the debugging work
https://bugzilla.gnome.org/show_bug.cgi?id=734726
The zooming animation of the windows looks nice when animating
from the workspace display page, but looks weird from other pages
like apps page or search page since the windows come from nowhere
with an initial position not known to the user.
Instead of that just fade the desktop with the windows in its
original position.
https://bugzilla.gnome.org/show_bug.cgi?id=732901
The DESKTOP window might not be located at (0,0), in particular
on multi-monitor setups. While we already consider this by setting
the clone's position, we then stuff the clone into a container which
ignores it - meh ...
https://bugzilla.gnome.org/show_bug.cgi?id=723306
If desktop icons are enabled and not covered by maximized windows,
we will fade them in/out during overview transitions. However when
moving background handling into mutter/gnome-shell, we ended up with
the overview background on top of the DESKTOP window clone, hiding
the fade transition.
Fix the stack order to bring the effect back.
https://bugzilla.gnome.org/show_bug.cgi?id=707671
Some consumers may want to construct their buttons specially, so allow them
to do that by adding a new API that takes a button instead of a label.
https://bugzilla.gnome.org/show_bug.cgi?id=710137
The cover pane is used to block events during transitions, but as
workspaces don't share the same container as other overview elements,
they are currently excempt from the event blocking.
Move the cover pane to the top-level overview container instead.
https://bugzilla.gnome.org/show_bug.cgi?id=709034
Moving the mouse fast enough during xdnd will trigger a xdnd-leave event
because the input shape is not updated until after the animation is done.
So simply ignore the leave events while the animation is in progress.
https://bugzilla.gnome.org/show_bug.cgi?id=708887
This method, which accepts a .desktop filename, is used to highlight
a specific application in the overview, for example because it has
just been created or installed.
https://bugzilla.gnome.org/show_bug.cgi?id=654086
The event catcher that covers the entire primary monitor during
transitions is currently inside a BoxLayout, relying in its
odd support for fixed position actors.
We already have a proper stack widget in place, move it there.
https://bugzilla.gnome.org/show_bug.cgi?id=703808
Instead of using the input mode, when the overview is not modal
it should use a Chrome-tracked actor, that is added to the input
region. Because the overview always takes pointer input when
visible, the actor is added at startup, and it is shown and hidden
as needed.
https://bugzilla.gnome.org/show_bug.cgi?id=700735
Some keyboard spot a dedicated search key, which gnome-settings-daemon
currently handles by spawning gnome-search-tool. It makes a lot of
sense to promote the Shell's integrated search feature instead, so
expose an appropriate DBus method g-s-d can use.
https://bugzilla.gnome.org/show_bug.cgi?id=700536
Instead of creating a bunch of random actors and then passing
them off to the controls manager, let the controls manager
construct them. This leaves the controls manager in charge
of the ordeal.
https://bugzilla.gnome.org/show_bug.cgi?id=694469
Rather than expose a dizzying array of methods related to managing
state that require infecting every user of the overview methods, try
to do the sensible and smart thing internally. Now, the overview
itself tracks when XDND drags start, and simply calling show, hide or
toggle while an XDnD drag is in effect will show the overview, and
will only take the grab until after the XDND drag ends.
https://bugzilla.gnome.org/show_bug.cgi?id=663661
This cleans up the code considerably, and makes it so that
one path creates all hot corners for all monitors. Why this
wasn't done originally, I have no clue...
The one complication is debouncing if the button and hot corner
are triggered in rapid succession, so we just move this tracking
to the overview.
https://bugzilla.gnome.org/show_bug.cgi?id=663661
Previously, the overview BoxLayout was sized and positioned explicitly
using the primary monitor coordinates, as its parent was at 0,0 and
with a fixed layout manager. Now we use a bin layout, so we need to
position and size the stack actor, and set the overview boxlayout to
expand.
Take also the occasion to use a MonitorConstraint instead of handling
position and size manually.
https://bugzilla.gnome.org/show_bug.cgi?id=694969
We used to clip the overview group to prevent the dash from sliding into
neighbor monitors, but now it moved to the groupStack, so we must move
the clip too.
https://bugzilla.gnome.org/show_bug.cgi?id=694970
We generally want view content centered, in particular where the
view itself is symmetrical. So move the dash to a separate layer
and use a placeholder to account for its size when showing the
window picker, which is the only view where it doesn't make sense
to center the content.
https://bugzilla.gnome.org/show_bug.cgi?id=694261
Commit 43ed66cf26 changed the toplevel overview actor, so it
makes sense to change the show/hide transitions to use that instead
of the existing group, to avoid elements layered on top of the
group being excluded from the transitions.
It is useful at times to perform several actions that would usually
close the overview (for instance launching an application) at once.
Currently we allow this by dragging items to a workspace rather than
just clicking it, but it's an odd metaphor with its own set of
problems.
Introduce an alternative approach (inspired by file selection in
file managers) by keeping the overview open if a Control key is
held down.
https://bugzilla.gnome.org/show_bug.cgi?id=686984
Using the scroll wheel in the window picker should switch workspaces.
As the picker doesn't have a visible boundary though, it makes sense
to accept scroll-event for the entire overview area. Rather than
making the overview's main actor public, expose scroll-events via
a signal.
https://bugzilla.gnome.org/show_bug.cgi?id=686639
This commit updates the code to use mutter's new background
api, and changes the shell's startup animation to be closer
to the mockups.
Based on initial work by Giovanni Campagna
https://bugzilla.gnome.org/show_bug.cgi?id=682429
All the complexity with a custom actor and a generic container was
just to add some padding below the overview controls. Remove that,
and use CSS instead.
https://bugzilla.gnome.org/show_bug.cgi?id=694100
Account for the search entry space at the bottom (the former message
tray clone) individually in each side control, instead of packing
another actor in the overview.
This allows us to extend the central view all the way to the bottom,
while still keeping controls centered vertically.
https://bugzilla.gnome.org/show_bug.cgi?id=693987
And use it in overviewControls. When we moved this code from overview.js
to overviewControls.js we lost a condition so we now slide in controls
even when going back from the overview, which looks bad.
https://bugzilla.gnome.org/show_bug.cgi?id=693974
Both WorkspacesDisplay and ThumbnailsBox need to know when windows have been
restacked. Instead of each tracking changes on their own or trying to call
each other, have the overview keep track and do the calculations, emitting
a signal with the result.
https://bugzilla.gnome.org/show_bug.cgi?id=690175
Adjust the layout of the overview and window thumbnails to make them
bigger. Also, make the background shade darker to compensate for the
increased thumbnail density.
https://bugzilla.gnome.org/show_bug.cgi?id=689876
The message tray actor also includes notifications themselves. We want
our ghost to be sized as the base part of the tray instead.
Just make sure to use the same style class as the base actor then, as
its height is specified by the CSS.
https://bugzilla.gnome.org/show_bug.cgi?id=690174
When pressing the overlay key three times, things went like this:
* show(), push a modal
* hide(), will pop a modal after hiding is done
* show(), push a modal
Thus, when the showing is done, and then it activated the hiding,
it popped one modal, but not the other. This patch changes things
to be:
* show(), push a modal
* hide(), will pop a modal after hiding is done
* hide(), no-op
That is, mashing the overlay-key when it's showing will always make
it hide, not mashing an odd number of times.
https://bugzilla.gnome.org/show_bug.cgi?id=688589
Currently we assume that either the initial sessionMode will have
the overview or none of the pushed modes - starting without the
overview and pushing a mode that adds it fails spectacularly.
However this is exactly what we are going to do when loading external
modes asynchronously - we'll initially use the default mode while
the modes are loading, and switch to the mode passed on the command
line when finished. So make sure that the overview UI gets initialized
properly in that case.
https://bugzilla.gnome.org/show_bug.cgi?id=689304
For now we just use it to assign an identifier to modal modes in
which we want to allow some keybindings, but we don't use it for
any actual filtering; we'll start doing this shortly.
https://bugzilla.gnome.org/show_bug.cgi?id=688202
When in the overview, if you move the mouse cursor over one of the
application launchers in the dash, all the unrelated windows are dimmed
both both in the window view and in the workspace view.
It helps to easily understand whether or not there are already opened
windows for this application, and where they are. It can also help in
differentiating the windows in the overview (sometimes the thumbnails
aren't precise enough to easily know which thumbnail belongs to which
application).
https://bugzilla.gnome.org/show_bug.cgi?id=657315
Adding a radial gradent to the dimming effect gives more depth to
the background.
Shading is computed in a GLSL fragment shader, and uses distance to
center of the screen to interpolate the darkening value to use.
Based on a patch by Pierre-Eric Pelloux-Prayer <pelloux@gmail.com>
https://bugzilla.gnome.org/show_bug.cgi?id=669798
Notifications that are created in response to direct user actions like
"is ready" or "'foo' has been removed from favorites" should always be
displayed even though the user has marked him/herself busy.
https://bugzilla.gnome.org/show_bug.cgi?id=662900
This ensures that the desktop window's smooth fadeout when going to
the overview is in the same spot as the desktop window, which may not
always be at 0, 0.
https://bugzilla.gnome.org/show_bug.cgi?id=681159
As PAM messages are now shown below the password entry, there is no
need for this complexity, and we can just hide all notifications.
Also, this avoids the ambiguity between notification.showWhenLocked and
source.showInLockScreen, which have very different effects.
https://bugzilla.gnome.org/show_bug.cgi?id=683369
Since we eventually want to add a system for changing the top panel
contents depending on the current state of the shell, let's use the
"session mode" feature for this, and add a mechanism for updating the
session mode at runtime. Add support for every key besides the two
functional keys, and make all the components update automatically when the
session mode is changed. Add a new lock-screen mode, and make the lock
screen change to this when locked.
https://bugzilla.gnome.org/show_bug.cgi?id=683156
Commit 22eea750 made info messages show up in the lock screen, but
as setShowWhenLocked() throws an exception when called on non-transient
notifications, the transient hint has to be set first.
https://bugzilla.gnome.org/show_bug.cgi?id=682268
We pass the dash’s showApps button to the viewSelector, and we connect it
to the showing and hiding of the appsView. This is necessary because there
are different mechanisms for switching the views, and it has to stay in
sync with the button’s state.
https://bugzilla.gnome.org/show_bug.cgi?id=682109
The entry should be positioned in the center of the overview. This makes
that its position can’t be set in the viewSelector without making things
overly complicated. Therefore we move the entry to the overview.
https://bugzilla.gnome.org/show_bug.cgi?id=682109
Design calls for views being accessible by other means than the current tab
system, so we have no longer a need for the public viewTab API. Move the
initialization of tabs to the viewSelector and make
viewSelector.addViewTab() private.
https://bugzilla.gnome.org/show_bug.cgi?id=682109
Track screen lock status in the message tray, and filter banner
notifications. The message tray is completely hidden when the screen is
locked, but exceptions can be made for individual transient notifications,
such as shell messages and the on screen keyboard.
Non transient sources are shown in the middle of the lock screen. Resident
notifications (such as those from Rhythmbox) are shown in full, while
persistent ones are displayed as icon and message count.
https://bugzilla.gnome.org/show_bug.cgi?id=619955
The dependency chain spirals out from folks->zeitgeist->xapian...and
I'm really not interested in pulling in all of that into the core
shell.
There is work on splitting out contact search into gnome-contacts; I'd
add a bug link but Bugzilla is down.
clutter_actor_get_children requires making a temporary GSList from
a linked list structure, and then creating a JS Array from that GSList.
For simple cases like the number of children, use clutter_actor_get_n_children.
https://bugzilla.gnome.org/show_bug.cgi?id=677426
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
When transitioning from gnome-panel to gnome-shell in 3.0 we
lost the ability to summon the wisdom of the mythical fish.
This patch restores this, for the few adepts that are aware of
the magical incantation.
(Not as configurable as the original one, but it's an easter egg
after all...)
https://bugzilla.gnome.org/show_bug.cgi?id=666606
WorkspacesDisplay was introduced to manage the workspace objects
and views; however, the overview still accesses the view held
by the workspacesDisplay directly, which is a bit odd.
Add some additional methods needed by the overview, and make the
view a private property.
https://bugzilla.gnome.org/show_bug.cgi?id=652580
The last patch in the sequence. Every place that was previously
setting prototype has been ported to Lang.Class, to make code more
concise and allow for better toString().
https://bugzilla.gnome.org/show_bug.cgi?id=664436
js2-mode is no longer developed and we recommend js-mode these days,
so switch the modelines to specify that, and make them consistent
across all files.
https://bugzilla.gnome.org/show_bug.cgi?id=660358
As extensions are now expected to provide a "disable" function,
they need to remove search providers they added. Implement the
removal functionality and add a public removeSearchProvider()
method.
https://bugzilla.gnome.org/show_bug.cgi?id=657548
This adds contacts search to shell, powered by libfolks.
Changes:
- Add Folks and Gee to the build system
- ShellContactSystem, a backend in C
- ContactDisplay, search frontend in JS
https://bugzilla.gnome.org/show_bug.cgi?id=643018
Doing this rather than overdrawing a black rectangle saves us
(pixels in screen) * 8 bytes of memory bandwidth for every frame we draw going
into the overview.
It also allows us to dim the background on non-primary monitors making the
overall overview appearance consistent across all monitors.
https://bugzilla.gnome.org/show_bug.cgi?id=656433
Instances of this class share a single CoglTexture behind the scenes which
allows us to show the background with different rendering options without
duplicating the texture data.
https://bugzilla.gnome.org/show_bug.cgi?id=656433
We're not going to want an overview at the login screen,
but a lot of code in the shell depends on the overview
existing.
This commit adds a new isDummy constructor property to
allow creating the overview as a non-functional, stub object
that doesn't do anything visible.
https://bugzilla.gnome.org/show_bug.cgi?id=657082
The dash object is currently exposed as a public object.
It's only used outside of the overview for the dash object's
iconSize property though.
This commit makes the dash object private and proxies the dash
iconSize property to the overview.
https://bugzilla.gnome.org/show_bug.cgi?id=657082
This dramatically thins down and sanitizes the application code.
The ShellAppSystem changes in a number of ways:
* Preferences are special cased more explicitly; they aren't apps,
they're shortcuts for an app), and we don't have many of them, so
don't need e.g. the optimizations in ShellAppSystem for searching.
* get_app() changes to lookup_app() and returns null if an app isn't
found. The semantics where it tried to find the .desktop file
if we didn't know about it were just broken; I am pretty sure no
caller needs this, and if they do we'll fix them.
* ShellAppSystem maintains two indexes on apps (by desktop file id
and by GMenuTreeEntry), but is no longer in the business of
dealing with GMenuTree as far as hierarchy and categories go. That
is moved up into js/ui/appDisplay.js. Actually, it flattens both
apps and settings.
Also, ShellWindowTracker is now the sole reference-owner for
window-backed apps. We still do the weird "window:0x1234beef" id
for these apps, but a reference is not stored in ShellAppSystem.
The js/ui/appDisplay.js code is rewritten, and sucks a lot less.
Variable names are clearer:
_apps -> _appIcons
_filterApp -> _visibleApps
_filters -> _categoryBox
Similarly for function names. We no longer call (for every app) a
recursive lookup in GMenuTree to see if it's in a particular section
on every category switch; it's all cached.
NOTE - this intentionally reverts the incremental loading code from
commit 7813c5b93f. It's fast enough
here without that.
https://bugzilla.gnome.org/show_bug.cgi?id=648149
Remove ShellGlobal's monitor-related methods, and have
Main.layoutManager provide that information instead. Move
Main._relayout() to LayoutManager, and have other objects connect to
the layout manager's 'monitors-changed' signal to know when the screen
geometry has changed.
https://bugzilla.gnome.org/show_bug.cgi?id=636963
Currently activating a window on a different workspace requires very
long drag distances, which is very inconvenient to use.
Fix that by allowing switching workspaces using the thumbnails which is
consistent with window and launcher dnd and much easier to use.
https://bugzilla.gnome.org/show_bug.cgi?id=643945
Don't do an individual hover fixup for every window overlay, instead
just use the new global.sync_hover() to fix up hovers once we have
finished showing the overview.
Based on a patch from Adel Gadllah <adel.gadllah@gmail.com>
https://bugzilla.gnome.org/show_bug.cgi?id=638613
Do a basic job of converting font sizes from pixels to points, so they
will scale will the global GNOME scale factor. Some other sizes that are
clearly related to the font sizes are changed to ems, but no comprehensive
attempt is made to get rid of px units.
https://bugzilla.gnome.org/show_bug.cgi?id=636868
WorkspacesDisplay removes its dragMonitor in _dragEnd, but
this was never called in when a xdnd drag ended causing
dragMonitors to stack up and handling events multiple times.
Fix that by making sure that _dragEnd is called when xdnd ends.
https://bugzilla.gnome.org/show_bug.cgi?id=644642
Add the idea of an 'id' for a tab, and add a public switchTab method
so you can switch to 'applications' or 'windows'. This will be useful
for performance tests that test tab switching performance.
https://bugzilla.gnome.org/show_bug.cgi?id=644266
We currently show the workspace in the overview in a rectangle
with the same aspect ratio as the screen. Originally this was
probably done since it showed the desktop, but we don't do this
anymore, and the positioning of the windows in the overview is
strictly a grid, so its not in any way related to monitor geometry.
Additionally, in the multihead case the screen aspect ratio is
very different from the overview monitor geometry, so a lot of
space is lost.
So, instead we just fill the entire inner rectangle of the overview
with the workspace. However, the way the zoom into and out of the
workspace right now is by scaling the workspace so that it covers
the entire monitor. This cannot really work anymore when the workspace
is a different aspect ratio. Furthermore the coordinates of the
window clone actors are of two very different types in the "original
window" case and the "window in a slot case". One is screen relative,
the other is workspace relative. This makes it very hard to compute
the cost of window motion distance in computeWindowMotion.
In order to handle this we change the way workspace actor positioning
and scaling work. All workspace window clone actors are stored in
true screen coordingates, both the original window positions and the
in-a-slot ones. Global scaling of the workspace is never done, we
just reposition everything in both the initial zoom and when the
controls appear from the side.
There is one issue in the initial and final animations, which is that
the clip region we normally have for the workspacesView will limit the
animation of the clones to/from the original positions, so we disable
the clip region during these animations.
https://bugzilla.gnome.org/show_bug.cgi?id=643786
Add Ctrl-Alt-Tab support to ViewTab, and fix the Applications pane to
scroll to track the keyboard focus.
The Windows pane can be switched to, but navigation within the pane is
not yet implemented.
https://bugzilla.gnome.org/show_bug.cgi?id=618887
1. disconnect destroy signals in popModal (actors can have great lifetime and then pushed again)
2. incorrect pushModal/popModal pair in overview
https://bugzilla.gnome.org/show_bug.cgi?id=64078
Rather than connecting to stage::capture-event and then trying to
guess whether or not a given key-press should be handled by us or not,
handle the end-search-on-Escape case from entry::key-press-event
(since it only makes sense when the entry is focused anyway) and the
start-search-on-printable-key case from stage::key-press-event (which
will only get the events that no other actor wanted for itself).
Similarly, do exit-overview-on-Escape and switch-panes cases from
stage::key-press-event, rather than
viewSelector.actor::key-press-event, so that they will work correctly
even if the keyboard focus is somewhere else. (Also fix a longstanding
bug in the pane-switching code, which was supposed to be disabled when
a search was active, but was checking a non-existent variable.)
https://bugzilla.gnome.org/show_bug.cgi?id=642502
When the user cancels the drag while hovering over a window the timeout
handler will throw an exception because the drag actor will be destroyed
at this point.
Fix that by removing the timeout in _onDragEnd.
The xdnd timestamp gets updated on every xdnd-position event,
so while waiting for the window timeout to fire we need to make sure we
update the timestamp when getting on motion to activate the window
with the correct timestamp.
We need the view selector to extend all the way to the right edge of the
monitor, so size and position the view selector in a way that the sum of
its X position and its width add up to the primary monitor width.
https://bugzilla.gnome.org/show_bug.cgi?id=642834
As Main.overview is now usable from the view selector's constructor,
move the setup of signal connections there and remove the show/hide
methods which were used as workaround.
https://bugzilla.gnome.org/show_bug.cgi?id=642196
As Main.overview is now usable from the dash's constructor, move
the setup of signal connections there and remove the show/hide
methods which were used as workaround.
https://bugzilla.gnome.org/show_bug.cgi?id=642196
The Overview does not only hold the different elements visible in
the overview, but is also a central point to manage drag signals.
As objects which are constructed in the overview constructor cannot
access Main.overview (as its constructor has not finished yet), we
use misnamed show/hide methods to work around this limitation, which
are called when entering/leaving the overview.
A better way to handle this problem is to remove the limitation
altogether by splitting the overview constructor between internals,
which remain in the constructor, and more complex objects which
need to access Main.overview, and whose initialization is moved
to a public init() function which is called by main.js after the
overview has been constructed.
https://bugzilla.gnome.org/show_bug.cgi?id=642196
On button-release, a threshold is used to determine if the gesture
should be considered a click and thus ignored. While the drag is
active though, the controlled actor is dragged immediately. As a
result, dragging by a tiny amount does not trigger a snap back when
the action is interpreted as a click. As a fix, do not update the
dragged actor's position until the same threshold is passed.
https://bugzilla.gnome.org/show_bug.cgi?id=640494
The main overview group starts capturing events on button-press
events to implement swipe-scrolling. While reactive children of
the group which handle both button-press and button-release events
don't trigger swipe-scrolling, children that only rely on
button-release have stopped working - at least the primary/secondary
icons of the search entry are affected. While the capture handler
already checks the pointer movement between press and release to
determine whether the action should be considered a click rather
than a drag, it still blocks the release event from propagating.
Instead, only block release events for drag actions, but not for
clicks.
https://bugzilla.gnome.org/show_bug.cgi?id=640493
The workspaces view allows to drag the active workspace to swipe-scroll
to the next or previous workspace. While this behavior can come in handy
in general, there are good reasons to move the functionality to the
overview:
- Finding a spot on a workspace to start a drag can be hard,
especially when the workspace contains a single window
- With the new layout, workspaces have no visible border, making
it hard to predict where a drag can be initiated
- The same behavior is equally useful for other elements
So add setScrollAdjustment() to the overview, which allows setting
an adjustment controlled with swipe-scrolling (either horizontally
or vertically); only a single adjustment can be controlled at a
time. A swipe-scroll can be initiated on any part of the background that
is not occupied by a reactive actor. For cases where further control
is needed, 'swipe-scroll-start' and 'swipe-scroll-end' signals are
emitted.
https://bugzilla.gnome.org/show_bug.cgi?id=635034
Drag monitor functions are supposed to return a value, but
_onDragMotion() does not always do so. Add the missing return
value and remove unnecessary else.
Currently we reset the timeout on every mouse movement which means
the user has to keep the mouse at the exact same position for 1.25
seconds.
Be more tolerant and allow the user to move the mouse over the
window without reseting the timeout, which should make activating
windows easier.
https://bugzilla.gnome.org/show_bug.cgi?id=638896
GenericDisplay used to provide a common base class for places and
recent items, none of which exists anymore. As of current mockups,
display items in "Finding and Reminding" should be based on
BaseIcon / IconGrid instead.
The gnome-panel allows the user to hover over a tasklist entry
while draging to activate a minimized or obscured window and drop onto it.
Implement a similar behaviour by allowing draging to the activities button or
the hotcorner (and thus opening the overview), which allows the user to
activate any window (even on different workspaces) as a drop target.
https://bugzilla.gnome.org/show_bug.cgi?id=601731
When the user is doing a drag-and-drop, we want to temporarily show the
stage to allow them to drag to a different window. But we're not "really"
in the overview, and getting a grab would conflict with the X client doing
the drag and drop.
So add a showTemporarily()/hideTemporarily() pair of methods that show
the overview without grabbing.
This adds a lot more possibilities for asynchronous race conditions, so
rework the code to be more robust against multiple calls to show*()
and hide*(). The interpretation is now that all calls to show*() and
hide*() affect the state, but if we have conflicting calls to show and
hide we wait until the current animation is finished before correcting
to the right visual state.
https://bugzilla.gnome.org/show_bug.cgi?id=601731
According to the designers, system notifications should be transient;
so now that transient notifications are supported properly, make use
of it instead of using a timeout to remove the associated source.
