Before this, creating a separate instance of `Location.Indicator` failed
because it tries to create export the same DBus path.
This is useful for extensions adding panels on multiple monitors. But
it also seems like a cleaner design to separate the indicator widget
from the logically separate role as a Geoclue agent.
Part-of: <https://gitlab.gnome.org/GNOME/gnome-shell/-/merge_requests/1919>
We build controls layout using the whole monitor vertical space as
available, however extensions or external apps in X11 may reduce the
workarea size horizontally and the shell should always take care of it.
Given that we're already assuming that the allocation is monitor-based
and that we're adjusting it to the workarea, we can just make it more
explicit by using a workarea box that is used as the allocation area.
As per this, we also apply the same logic of applied to the vertical
dimension to the horizontal one.
Part-of: <https://gitlab.gnome.org/GNOME/gnome-shell/-/merge_requests/1892>
To compute the available height for the layout we're currently using the
panel position, while this works for the current and default setup, the
shell may be configured to use a different workarea, so we should rely on
it to compute the available space, instead of a specific widget.
So get the current monitor index for the current view and use its coordinates
instead.
Part-of: <https://gitlab.gnome.org/GNOME/gnome-shell/-/merge_requests/1892>
The background group is currently allocated taking care of the workarea
x, y offset but not of its width/height and this may lead to building a
wrongly sized workspace view when the workarea size is not matching the
monitor size (like when there are struts set).
So, take care of the difference between the workarea and monitor
absolute end coordinates to allocate the background scaled content box.
Part-of: <https://gitlab.gnome.org/GNOME/gnome-shell/-/merge_requests/1892>
We currently disable all network items on both the lock- and login
screen. While it makes sense to be very restrictive on the lock screen,
there are some (fringe) use cases for being more permissive on the
login screen (like remote home directories only accessible via VPN).
There's precedence with the power-off/restart actions to be less
restrictive on the login screen, and since we started respecting
the `network-control` polkit action, it's possible to restore the
old behavior if desired.
Part-of: <https://gitlab.gnome.org/GNOME/gnome-shell/-/merge_requests/1874>
NetworkManager installs a `network-control` polkit action that can
be used to disallow network configuration, except that we happily
ignore it. Add it to the conditions that turn a network section
insensitive.
Part-of: <https://gitlab.gnome.org/GNOME/gnome-shell/-/merge_requests/1874>
Setting up a connection for an Enterprise WPA(2) encrypted wireless
network requires Settings. That's not available when windows are
disabled via the session mode, so filter out affected entries.
Part-of: <https://gitlab.gnome.org/GNOME/gnome-shell/-/merge_requests/1874>
The item launches the corresponding Settings panel when activated, which
doesn't work when windows are disabled by the session mode. Rather than
failing silently, turn the item insensitive.
Part-of: <https://gitlab.gnome.org/GNOME/gnome-shell/-/merge_requests/1874>
Unaccelerated deltas make sure the gesture works the same regardless of how
fast the fingers move; this is what we were already doing for scrolling.
Remove the swipe multiplier as the deltas already match scrolling other than
the 1/10 multiplier Clutter applies to scrolling specifically.
Part-of: <https://gitlab.gnome.org/GNOME/gnome-shell/-/merge_requests/1763>
Since commit 3fb02843, we no longer skip allocation for
results that don't fit the width, and give them a 0x0
allocation instead.
That has the unintended side effect of those children now
being available to keynav. There are cases where we want
0-sized actors to be part of the focus chain (e.g. FocusTrap),
but this isn't one of them, so explicitly exclude 0-sized
children from keynav.
https://gitlab.gnome.org/GNOME/gnome-shell/-/issues/4470
Part-of: <https://gitlab.gnome.org/GNOME/gnome-shell/-/merge_requests/1916>
Destroying the source from an action callback will result in the
notification being destroyed twice:
- source.destroy() destroys all its notifications
- a notification destroys itself after an action
was activated
This results in unwanted log spam when attempting to dispose the
notification for a second time.
There is actually no good reason for destroying the source explicitly,
as sources already self-destruct with their last notification.
https://gitlab.gnome.org/GNOME/gnome-shell/-/issues/4457
Part-of: <https://gitlab.gnome.org/GNOME/gnome-shell/-/merge_requests/1908>
Currently we only mark the banner as removed if it is destroyed
while in SHOWN or SHOWING state, but not if we're already HIDING
(for example in response to `NotificationBanner::done-displaying`).
If this happens, we'll try to destroy the notification again at
the end of the transition, which leads to (harmless but annoying)
log spam since Notifications were turned into GObjects (that are
disposed when destroyed).
Address this by always marking destroyed banners as removed, while
still only triggering a state update while shown (or in the process
of being shown).
https://gitlab.gnome.org/GNOME/gnome-shell/-/issues/4457
Part-of: <https://gitlab.gnome.org/GNOME/gnome-shell/-/merge_requests/1908>
These do some some signals connection and monitor layout tracking
that we forget to disconnect when the magnifier is disconnected.
This causes warnings if enabling the magnifier, disabling it,
switching to another tty, and back. (Presumably also happens for
monitor hotplugs).
This signal should just stay connected as long as it's needed,
so add a setEnabled() method on the CrossHairs actor that we
can hook on the magnifier.
Part-of: <https://gitlab.gnome.org/GNOME/gnome-shell/-/merge_requests/1902>
Some popovers like the ibus candidate popover may be requested while
showing an unredirected fullscreen window. Disable unredirection
while the popover is visible so that it can actually be shown.
Part-of: <https://gitlab.gnome.org/GNOME/gnome-shell/-/merge_requests/1900>
When implementing a D-Bus method synchronously, regular JS methods are
used. That is, whatever the method returns is passed as return value
to the method invocation.
However for asynchronous implementations, we need to explicitly return
a value to the invocation, otherwise the caller will wait until it times
out eventually.
Part-of: <https://gitlab.gnome.org/GNOME/gnome-shell/-/merge_requests/1891>
The appDisplay used to be accessible via the viewSelector, but
that is gone now. Commit c09c070b15 adjusted the code, but the
replacement uses a Main.overview.appDisplay accessor that never
existed, whoops.
Fix this by exposing a new selectApp() method directly on the
overview, so we don't have to shuffle the appDisplay through
controls → overviewActor → overview.
Part-of: <https://gitlab.gnome.org/GNOME/gnome-shell/-/merge_requests/1891>
With Xwayland started on demand, mutter/gnome-shell will spawn Xwayland
and GNOME settings daemon Xsettings.
Currently, gnome-shell uses a timeout of 5 seconds before canceling the
launch and declare failure to start X11 services.
While 5 seconds may seem like a lot of time, when this is executed on a
virtual machine part of a QA tests under load, this causes random
failures.
There is no good value here, we could increase the timeout but it will
always remain racy. Instead, remove the timeout, systemd itself already
has a timeout mechanism (with a much longer wait time).
Thanks to Benjamin Berg <bberg@redhat.com> for finding the root cause
and suggesting the fix.
Part-of: <https://gitlab.gnome.org/GNOME/gnome-shell/-/merge_requests/1888>
Right now we pop the modal immediately when closing, so the key-release
event of the Escape key ends up in the focus window which may consume it
for leaving fullscreen mode or similar.
We can avoid that in many cases by keeping the modal grab until the end
of the transition, as the key-release event will then likely occur while
the grab is still in place (provided animations are enabled).
Part-of: <https://gitlab.gnome.org/GNOME/gnome-shell/-/merge_requests/1880>
If parsing the pipeline fails for some reason, we currently end up
with a zombie session that leads to a stuck recording indicator in
gnome-shell.
Instead, properly tear down the session to allow mutter and gnome-shell
to correctly update their state.
Part-of: <https://gitlab.gnome.org/GNOME/gnome-shell/-/merge_requests/1878>
org.freedesktop.impl.portal.desktop.gnome will be used for the
GNOME implementation of desktop portals in the future, so make
sure GNOME Shell's implementation of the access portal won't
conflict.
Part-of: <https://gitlab.gnome.org/GNOME/gnome-shell/-/merge_requests/1872>
Another trivial cleanup. This is in preparation for next commit, that
will expand on this if clause, and will make it a bit more complicated.
Using a variable here makes it easier to read.
Part-of: <https://gitlab.gnome.org/GNOME/gnome-shell/-/merge_requests/1866>
Often, when using multiple monitors, the thumbnails box may be
destroyed before the 'hidden' signal of the Overview is emitted,
which leaves a bunch of lingering signal connections to the
workspace manager.
Call this._destroyThumbnails() in the _onDestroy handler, which
disconnects from workspace manager. This fixes the some of the log
spam that GNOME Shell produces with backtraces of destroyed actors.
Part-of: <https://gitlab.gnome.org/GNOME/gnome-shell/-/merge_requests/1860>
On systems/setups not using systemd, a failure to start gsd-xsettings
with NOT_SUPPORTED does not denote a failure to start Xwayland, just
that we're not using systemd.
In that case, we should just ignore the error, otherwise it will prevent
Xwayland to start on such systems/setups without systemd.
Thanks to Rose Kunkel (@rosekunkel) for spotting the issue/suggesting
the fix.
Fixes: 019229c40e - windowManager: Return failure to start X11 services
Closes: https://gitlab.gnome.org/GNOME/gnome-shell/-/issues/4284
Part-of: <https://gitlab.gnome.org/GNOME/gnome-shell/-/merge_requests/1850>
Currently, handling of touch devices in the app grid is a bit awkward,
paging by dragging the view can only happen if started from the gaps
between icons, trying to drag from an icon will trigger DnD, and popping
up the menu takes over it all.
Instead, have the app grid actions play this game of rock-paper-scissors:
- Fast swipes on icons trigger scrolling, beats DnD and menu
- Slower press-and-drag on icons trigger DnD, beats scrolling and menu
- Long press triggers menu, beats scrolling, is beaten by DnD
This allows quick swipes to handle navigation, while still allowing the
fine grained operations. DnD, when triggered, dismisses the menu, if
shown.
This all could probably be nicer with a more stateful gesture framework,
we're not there yet though.
Fixes: https://gitlab.gnome.org/GNOME/gnome-shell/-/issues/3849
Part-of: <https://gitlab.gnome.org/GNOME/gnome-shell/-/merge_requests/1774>
This setting (by default, 0) sets a time threshold in order to allow
DnD. If the drag is shorter than this threshold, DnD will be cancelled,
and event handling left to the next handlers.
Part-of: <https://gitlab.gnome.org/GNOME/gnome-shell/-/merge_requests/1774>
The switcherPopups use _next() and _previous() to get the items
in the text direction. I. e. with LTR _next() gets the right item;
on RTL it gets the left item. This doesn't work well with RTL when using
the arrow keys since the text direction doesn't matter in those cases.
Pressing Left Arrow should still move left regardless of text direction.
So use the opposite methods.
Fixes https://gitlab.gnome.org/GNOME/gnome-shell/-/issues/2547
Part-of: <https://gitlab.gnome.org/GNOME/gnome-shell/-/merge_requests/1835>
If for some reason the xserver failed to start, mutter/gnome-shell
should not attempt to connect to the X11 display otherwise it will
lock up in XCB.
An indication of such a premature failure of the xserver is when the X11
services fail to start.
Return the status so that the caller can cancel the connection in time
and avoid the lockup of mutter/gnome-shell in case of failure.
This, however, makes the X11 services a critical component to start
Xwayland, meaning that a failure to start those services for any other
reason than the xserver failing to start would still prevent Xwayland
and therefore X11 clients to run in Wayland. This is however a lesser
issue than mutter/gnome-shell locking up.
This basically reverts commit a96753f0 - "windowManager: X11 can work
without gsd-xsettings".
Part-of: <https://gitlab.gnome.org/GNOME/gnome-shell/-/merge_requests/1837>
Change behavior on pressing Super+Number in Activities/Overview mode
so that the overview mode is hidden and application can be used.
This makes it consistent with clicking icon in the dash.
Closes: #4212
Part-of: <https://gitlab.gnome.org/GNOME/gnome-shell/-/merge_requests/1839>
Previously the workarea was only set on construction and then never
updated. As a result the preferred width and height as well as the
allocation were based on an outdated workarea size when it changed after
construction. This for example was happening during the startup
animation, for which the WorkspaceLayout is constructed before the panel
is shown. This caused the workspace in the overview to be slightly
smaller when it is first shown and the overview closing animation to
not expand the workspace to the correct size the first time it is
closed.
Fixes https://gitlab.gnome.org/GNOME/gnome-shell/-/issues/3945
Fixes https://gitlab.gnome.org/GNOME/gnome-shell/-/issues/3816
Part-of: <https://gitlab.gnome.org/GNOME/gnome-shell/-/merge_requests/1771>
In the nested session the startup animation sometimes fails, weirdly
that always happens to me when running a freshly built gnome-shell the
first time. The reason it fails is that mutter fails to aquire a pointer
grab from the xserver, XIGrabDevice() is unsuccessful.
A simple workaround for this race condition in the xserver is to just
grab the devices a bit later, that is after the startups animation
instead of before it.
This was also tested with disabled animations, and seems to work just as
well in that case.
Part-of: <https://gitlab.gnome.org/GNOME/gnome-shell/-/merge_requests/1812>
Some drag actor parents might change their width to 0 after the drag
actor has been removed. If the drag is now canceled and the drag actor
is animated to return to the current parent position and scale, this
scale can not be determined and falls back to 1.0. This might be wrong
and can result in the drag actor being too large/small at the end of the
return animation.
To avoid this calculate the scale of the parent by recursively
calculating the product of its parents individual scales.
Fixes https://gitlab.gnome.org/GNOME/gnome-shell/-/issues/4017
Part-of: <https://gitlab.gnome.org/GNOME/gnome-shell/-/merge_requests/1790>
We want to clip the Workspace actor in the appGrid state of the overview
in order to make sure windows that overflow the monitor don't spill out.
So far we had commit b1970b95b8 for that.
Now since the last commit, window previews always slightly overflow the
allocation with their icons. That means a part of the window icon gets
clipped away as soon as the transition to the appGrid starts, which
looks weird.
Fix that bug in the transition by slightly extending the clip downwards
when animating between the window picker and the app grid state. The
extra height we extend the clip by is controlled by the overviewState,
which means we extend the clip by the full icon overlap in the window
picker state, but don't extend the clip at all when in the app grid
state.
Part-of: <https://gitlab.gnome.org/GNOME/gnome-shell/-/merge_requests/1813>
We want to use as much space as possible for showing window previews in
the overview, and the title and close buttons of those windows are only
visible on hover, so we can show them above anything if we want.
On both primary monitors and secondary monitors, there's a certain free
space available towards the bottom edge of the monitor (on the primary
monitor we show the dash there, and secondary monitors just scale down
the Workspaces). We can make use of this by checking how much free space
there is available from the bottom edge of our allocation to the bottom
edge of the monitor, and then aligning the window previews to make full
use of this space.
So stop adding any padding to the edges of the Workspace, which will
make the windows a lot larger and completely fill the Workspaces
allocation.
The left, top and right monitor edges should always be far enough away
to accomodate the close button and hover scale-up of the window. Only
with the bottom edge of the monitor we have to be a bit more careful
(the overflowing height of the window title is quite big), so there we
check if enough free space is available. If there isn't enough free
space, we simply apply a bit of bottom padding again and shift the
window up.
Part-of: <https://gitlab.gnome.org/GNOME/gnome-shell/-/merge_requests/1813>
Make the SecondaryMonitorDisplay a bit more similar to the
ControlsManager container on the primary monitor, and clip that widget
instead of the WorkspacesViews on secondary monitors.
This will allow us to overpaint the WorkspacesView allocation and paint
the WindowPreview overlays like the title and close button outside the
allocation with the next commit.
Part-of: <https://gitlab.gnome.org/GNOME/gnome-shell/-/merge_requests/1813>
The current gstreamer pipeline performs quite bad on slower machines and
is dropping lots of frames, improve the pipeline by changing a few
things:
- Use threads for videoconvert and improve speed of videoconvert by
disabling some unneeded things
- Add a queue before the encoding step, this allows the encoder to work
at its own pace and will lead to a lot more stability
- Remove the fixed quantizer and only set a max quantizer, this helps
quite a bit with performance
- Change the deadline parameter of vp8enc to 1: This makes the encoder
go into real time mode, which will make it a lot faster
- Set cpu-used to 16, the maximum possible value.
- Set static-threshold to 1000, static-threshold is the motion detection
threshold, and while a value of 100 is recommended for screencasting in
the gstreamer documentation (see [1]), using 1000 appears to perform a
lot better and still outputs fairly good quality
- Set a larger buffer size than the default size, this seems to get a
bit more stability during high load scenarios
All in all, those changes make the pipeline drop no more frames when
recording at 30 FPS and 2K screen resolution. That was tested on a
fairly recent mobile core-i5 processor.
Also, because we now have two %T replacement strings for the number of
threads, we need to switch to replaceAll(). For that to work, we have to
put the %T matching expression into quotes.
[1] https://gstreamer.freedesktop.org/documentation/vpx/GstVPXEnc.html?gi-language=c#GstVPXEnc:static-threshold
Part-of: <https://gitlab.gnome.org/GNOME/gnome-shell/-/merge_requests/1633>
The original parent of a dragged actor might have been destroyed after
the drag has been started. When the drag is canceled and _dragOrigParent
is set, the code is trying to get the current position and size of it
when restoring. With a destroyed parent this however would result in a
crash.
This could happen for example when starting a drag on a window preview
while the overview is hiding and then releasing it once the transition
is done.
Fixes https://gitlab.gnome.org/GNOME/gnome-shell/-/issues/4024
Part-of: <https://gitlab.gnome.org/GNOME/gnome-shell/-/merge_requests/1817>
`ThumbnailsBox` listens for the `showing` signal from the `Overview` to
create its thumbnails and destroys them on the `hide` signal. Since the
`showing` signal can be emitted multiple times when switching between
the shown and hidden state without ever fully completing the transition,
this will cause `_createThumbnails` to be called multiple times, each
time adding another set of workspaces.
Fixes: https://gitlab.gnome.org/GNOME/gnome-shell/-/issues/3819
Part-of: <https://gitlab.gnome.org/GNOME/gnome-shell/-/merge_requests/1828>
When starting a gesture to open the overview while a transition to hide
the overview is running, Overview._shown will be first set to false when
starting the transition and then to true by the gesture before the
`onComplete` callback is called. The `onComplete` callback in this case
is `Overview._hideDone()` which starts a transition to show the overview
again which also emits the `showing` signal. Since the gesture emits a
`showing` signal as well, this results in two consecutive `showing`
signals without a `hiding` signal in between.
This breaks the `searchControler` which adds a key press handler to
start the search on `showing` and removes it on `hiding`. So every time
this happens a new handler that will never be removed is added,
resulting in the first key press being repeated.
Fixes: https://gitlab.gnome.org/GNOME/gnome-shell/-/issues/4004
Related: https://gitlab.gnome.org/GNOME/gnome-shell/-/issues/3819
Part-of: <https://gitlab.gnome.org/GNOME/gnome-shell/-/merge_requests/1828>
For the screensaver service, it is quite normal that a consumer only
subscribes to the "ActiveChanged" signal without calling any methods.
The result is that we don't know about the consumer, and shut down
the service anyway after we hit the timeout.
If this happens, we break functionality like gnome-settings-daemon's
screen blanking on idle.
Fix this by simply disabling auto-shutdown for the service, which
also reflects the expectation that the screen saver service is
always running in a GNOME session.
https://gitlab.gnome.org/GNOME/gnome-shell/-/issues/4114
Part-of: <https://gitlab.gnome.org/GNOME/gnome-shell/-/merge_requests/1824>
It can happen that we get a problem report and a verification failure at
the same time. For fingerprint, a problem report can result in an
internal verification failure to be queued.
Remove this queued failure again if we got a failure already from GDM
directly.
Part-of: <https://gitlab.gnome.org/GNOME/gnome-shell/-/merge_requests/1821>
At the moment a failure in a background service can lead to the
various verification signals getting disconnected, even though
we still need them for a foreground service.
This commit changes the code to only disconnect when we've run
out of tries.
Part-of: <https://gitlab.gnome.org/GNOME/gnome-shell/-/merge_requests/1821>
At the moment we set the state of the auth prompt to failed any
time the user fails an attempt. But verification is still going
on until the user exhausts all attempts, so that's wrong.
This commit changes it to only set the state to failed when the
user is out of tries.
Part-of: <https://gitlab.gnome.org/GNOME/gnome-shell/-/merge_requests/1821>
At the moment we treat a failure in any service as a signal to stop
tracking users responses to service questions.
This commit makes sure we don't stop waiting for answers if a background
service fails.
Part-of: <https://gitlab.gnome.org/GNOME/gnome-shell/-/merge_requests/1821>
When we press a key with variants, we used to prevent an
early ::pressed, because a long press could show the options
popover, and the press be undone.
In addition, this long press could move to one of the suboptions,
and be released there. For this case we also want this late
emission of the ::pressed signal.
This makes the "tap, drag, release" pattern work on the
regular OSK keys, in addition to the emoji panel.
Part-of: <https://gitlab.gnome.org/GNOME/gnome-shell/-/merge_requests/1789>
This is already allowed for pointer events, but touch events still expected
that the touch begin and end happen on the same Key actor. Change this
behavior for touch events, this is necessary for the tap-drag-release
pattern to select key variants to work on all input devices.
Part-of: <https://gitlab.gnome.org/GNOME/gnome-shell/-/merge_requests/1789>
At the moment the timed login feature is implemented in the user list.
If there's no user list, we don't show the indicator anywhere and
don't proceed with timed login.
This commit allows timed login to work when the user list is disabled.
It accomplishes this by putting the timed login indicator on the
auth prompt in that scenario.
Part-of: <https://gitlab.gnome.org/GNOME/gnome-shell/-/merge_requests/1809>
When super is pressed again during the overview transition, we shift
up to the app grid. That means that the feature currently doesn't
work when animations are disabled (like in a VM), because there is
no transition in that case.
Address this by adding a time-based fallback in that case, i.e.
shift up when a second super-press occurs within 250ms after the
first one.
https://gitlab.gnome.org/GNOME/gnome-shell/-/issues/4121
Part-of: <https://gitlab.gnome.org/GNOME/gnome-shell/-/merge_requests/1811>
Using the callback directly as signal handler means that it will
receive the signal parameters (in this case: the StButton instance
that emits the signal).
This leaks an implementation detail that is harmless in the best
case, but can break dialogs when using bind() on the callback.
Avoid that trap by explicitly calling the callback without arguments.
https://gitlab.gnome.org/GNOME/gnome-shell/-/issues/4139
Part-of: <https://gitlab.gnome.org/GNOME/gnome-shell/-/merge_requests/1819>
For the primary monitor workspace thumbnail, we must keep the monitor
index in sync with what is currently the primary monitor index,
otherwise we might end up trying to move windows to non-existing
monitors.
For example, if the primary monitor index was 1 when the thumbnail box
was created, but later, the primary monitor index changed to 0, with the
other monitor being turned off, moving a window to one of the workspaces
on the workspace thumbnail, gnome-shell would attempt to move it to the
monitor with the index the primary monitor had in the past, with the
problem being that that monitor no longer exists.
Fix this by listening on the 'monitors-changed' signal on the layout
manager, and update the monitor index of the primary workspace
thumbnails box. Make sure to connect to the signal before creating the
thumbnails box, as the thumbnails box itself will listen to the signal
and recreate its actual thumbnails, and it must do this with the up to
date monitor index.
Closes: https://gitlab.gnome.org/GNOME/gnome-shell/-/issues/4075
Part-of: <https://gitlab.gnome.org/GNOME/gnome-shell/-/merge_requests/1810>
When OverviewControls goes from HIDDEN to APP_GRID, it constantly checks
if AppDisplay needs to be visible or not by checking the current overview
state is bigger than WINDOW_PICKER. Turns out in this case this check is
problematic, because when the current state trespasses WINDOW_PICKER, the
layout manager will have already positioned AppDisplay halfway to its final
position.
Use either the final or the current state, whichever is biggest, when updating
the AppDisplay visibility. It optionally allows passing the overview state
params to _updateAppDisplayVisibility() so that we avoid a few trampolines to
recaltulate the adjustment state.
Part-of: <https://gitlab.gnome.org/GNOME/gnome-shell/-/merge_requests/1805>
Both app grid and window picker are now always visible in the overview,
so their handling of the PgUp/PgDown keys conflicts.
Resolve that by checking for the overview state instead.
Part-of: <https://gitlab.gnome.org/GNOME/gnome-shell/-/merge_requests/1798>
Window previews looks slightly offset to the left and top right now
because we don't use the same padding on all edges of the Workspace. We
do that because the oversize and overlap of the window previews is
different on all sides (for example the bottom overlap is very large
because there we show the window title).
To make sure window previews are always perfectly centered on the
Workspace, only use the largest one of the oversize values as spacing
and padding, and add the larger one of the overlap values for the
vertical padding in addition.
With this, we now center the window previews on the Workspace while
never overpainting the allocation of that Workspace to show overlays.
https://gitlab.gnome.org/GNOME/gnome-shell/-/issues/3634
Part-of: <https://gitlab.gnome.org/GNOME/gnome-shell/-/merge_requests/1670>
