GDBusProxy transparently handles the remote object appearing and
vanishing. It is therefore not an error if the service is not
running at the time the proxy is initialized, so we proceed and
try to read the list of profiles which is null in that case,
resulting in (harmless but annoying) warnings.
Avoid this by only reading the initial list of profiles if the
service has a name owner.
https://gitlab.gnome.org/GNOME/gnome-shell/-/issues/5992
Part-of: <https://gitlab.gnome.org/GNOME/gnome-shell/-/merge_requests/2518>
When propagating keys from the OSK, we usually feed these directly to
the IBusInputContext and let the IM handle the effects of this virtual
key event (which may also include feeding a key event back to us).
But these functions may also return a FALSE value if the key was "let
through" by the IM, which means the ball is in our yard again, and
we are responsible of letting this event get to its destination.
If that happens, just fall through, so the string is committed to
the client as an UTF-8 string, or propagated through keyboard events.
Closes: https://gitlab.gnome.org/GNOME/gnome-shell/-/issues/5930
Part-of: <https://gitlab.gnome.org/GNOME/gnome-shell/-/merge_requests/2508>
Consider the existing input sources MRU only valid if it contained
more than one element to pick from. Fixes the following situation
with initial-setup sessions:
- Initial setup Session starts, with several input sources already
configured ("us" between them)
- InputSourceManager initializes, only the default "us" keymap is
available
- MRU list is constructed, "us" is picked
- InputSourceManager catches up with session configuration, the
other extra sources are added
- MRU list is reconstructed, "us" is already the most recent
- Session ends up with "us" picked, regardless of its position in
the list, and no MRU existing prior to startup
If we consider the intermediate single-element MRU list invalid,
it is still possible to pick the best default source between all
the configured ones (the one that was put first in the list,
basically), after initialization is complete.
But also, it is unnecessary to have if there is a single source to
pick from. After the sources list has two elements or more, the
MRU list will become effective and preserved during changes to
the available sources.
Closes: https://gitlab.gnome.org/GNOME/gnome-shell/-/issues/5873
Part-of: <https://gitlab.gnome.org/GNOME/gnome-shell/-/merge_requests/2495>
There are cases where the animation time is set to 0 on purpose
in order to not animate. When animations are disabled via
/org/gnome/desktop/interface/enable-animations those animation
times are increased from 0 to 1. This makes the "Caps lock is on."
message appear unconditionally in the lockscreen for a brief moment.
Select the minimum between the two values. So that an animation time
0 is preserved instead of being replaced by 1.
Part-of: <https://gitlab.gnome.org/GNOME/gnome-shell/-/merge_requests/2471>
In older versions of GNOME, when a menu was used for Bluetooth devices,
we tried to avoid showing the Bluetooth menu to folks who didn't use
Bluetooth.
This kept causing problems as the menu would disappear if no
devices were setup and the platform "airplane mode" removed the
Bluetooth device from the USB bus, making it impossible to detect
whether a Bluetooth device existed, compared to a user unplugging a
removable Bluetooth device.
Closes: #5749
Part-of: <https://gitlab.gnome.org/GNOME/gnome-shell/-/merge_requests/2488>
When updating the MRU sources if there was no prior MRU, we want
to go with the unmodified list of sources in visibility order.
However iterating over object properties happens in an undetermined
order, so the initial MRU list ends up picking a value at random.
In order to prefer the sources list in the same order than they
appear in the menu if there was no prior MRU, order the keys
when accessing it and building the initial list of sources.
Closes: https://gitlab.gnome.org/GNOME/gnome-shell/-/issues/5873
Part-of: <https://gitlab.gnome.org/GNOME/gnome-shell/-/merge_requests/2487>
Use Meta.LaterType.BEFORE_REDRAW to queue setting the bind constraint
offset in an idle callback. This is needed since the signals that
trigger updating the offset may be emitted during allocation, at which
point queuing new relayouts isn't ideal, since it could result in
relayout cycles. In this case, we really do want to relayout as a side
effect of another actors allocation, so make this explicit.
This fixes a few warnings such as:
The actor '<unnamed>[<StBoxLayout>:0x3138d70]' is currently inside an
allocation cycle; calling clutter_actor_queue_relayout() is not recommended
Part-of: <https://gitlab.gnome.org/GNOME/gnome-shell/-/merge_requests/2476>
When a `PanelMenu.Button` is added to the `statusArea`, its menu is
added to the `PopupMenuManager` if it has one at the time. If a menu is
added later or a new one set, the new menu is never added.
Move the call to `PopupMenuManager.addMenu()` from `_addToPanelBox()`
to `_onMenuSet()`, which is called when the `PanelMenu.Button` is added
and whenever it emits the `menu-set` signal.
Part-of: <https://gitlab.gnome.org/GNOME/gnome-shell/-/merge_requests/2470>
Pipewire 0.3.52 via commit a1f33a99 introduced a change that affects how
long pipewiresrc holds onto the pw_buffers it dequeued. Before that
change the pw_buffer was held until the end of the videoconvert element
at the beginning of the pipeline. After that change the pw_buffer was
held onto until the filesink at the end of the pipeline. This was
starving MetaScreenCastStreamSrc of pw_buffers to record new frames
into, resulting in the majority of frames being missed, especially in
situations in which the encoder was taking longer.
Pipewire 0.3.57 via commit 1ea1d525 will allow queuing the pw_buffer
early again via the `always-copy` option. This however is only a
workaround until a proper solution is found in either pipewire or
gstreamer that does not depend on copying the buffer contents and
instead queues the pw_buffer again after videoconvert as prior to
a1f33a99.
Since it is not clear yet when a proper solution will arrive, this makes
use of `always-copy` as a workaround for now and should be reverted once
it is no longer needed.
Related: https://gitlab.gnome.org/GNOME/gnome-shell/-/issues/5585
Related: https://gitlab.freedesktop.org/pipewire/pipewire/-/issues/2461
Related: https://gitlab.freedesktop.org/gstreamer/gstreamer/-/issues/283
Part-of: <https://gitlab.gnome.org/GNOME/gnome-shell/-/merge_requests/2436>
The object the SignalTracker belongs to is stored in a map managed by
the SignalManager which keeps a reference to that object. This map is
never destroyed nor is any entry ever removed. This leads to all objects
that ever had SignalTrackers used on them being kept alive even after
all references outside of the SignalTracker are long gone. This then
also extends to other objects which are leaked indirectly through
reference chains from these objects.
And if some of those objects are GObjects, this will prevent them from
being finalized, leaking further resources. A StWidget for example will
not release its shadow textures.
Fix this by destroying the SignalTracker and removing it from the
SignalManager once the last signal it was tracking has been untracked.
A WeakMap could have been used as well, but we need the Map to be
iterable in some of the following changes.
Closes: https://gitlab.gnome.org/GNOME/gnome-shell/-/issues/5807
Closes: https://gitlab.gnome.org/GNOME/gnome-shell/-/issues/5796
Part-of: <https://gitlab.gnome.org/GNOME/gnome-shell/-/merge_requests/2466>
After the next commit, when some classes, such as PopupMenuManager try
to disconnect via a destroy handler, the SignalTracker might have
already been destroyed, so trying to get it from the SignalManager will
cause it to create a new one, which will then try to connect to the
destroy signal of the already destroyed object.
This could for example be triggered by changing backgrounds.
Fix this by not doing anything in disconnectObject if there is no
SignalTracker for that object.
Part-of: <https://gitlab.gnome.org/GNOME/gnome-shell/-/merge_requests/2466>
This reverts commit 085102be74.
We need the SignalManager map top be iterable at shutdown for some of
the following changes. A WeakMap is not iterable. This revert changes it
back to a regular Map, which re-introduces the leaks caused by this.
Those will be fixed differently by the two followup commits.
Part-of: <https://gitlab.gnome.org/GNOME/gnome-shell/-/merge_requests/2466>
Due to !2056 the monitor config is 2 instead of 4 on the desktop.
However, the constant `Meta.MonitorSwitchConfigType.UNKNOWN` is fixed to
4, and may cause the initial selection to be out of index thus fail to
display the switcher. This replaces the above constant to the actual
length of the switcher items.
Part-of: <https://gitlab.gnome.org/GNOME/gnome-shell/-/merge_requests/2451>
If a device has multiple connections set up, then at most one of
those can be active at a time, which is why they are presented
as radio items.
In contrast, VPN connections are not mutually exclusive, each can
be turned on or off independently. Setting :radio-mode on them
currently means that VPN connections can be activated, but never
disabled.
So instead of abusing the :radio-mode property to give VPN items
the UI we want, use regular items that reflect the desired behavior
and explicitly set up the UI the way we want.
Part-of: <https://gitlab.gnome.org/GNOME/gnome-shell/-/merge_requests/2426>
The object the SignalTracker belongs to is stored in a map managed by
the SignalManager which keeps a reference to that object. This map is
never destroyed nor is any entry ever removed. This leads to all objects
that ever had SignalTrackers used on them being kept alive even after
all references outside of the SignalTracker are long gone. This then
also extends to other objects which are leaked indirectly through
reference chains from these objects.
And if some of those objects are GObjects, this will prevent them from
being finalized, leaking further resources. A StWidget for example will
not release its shadow textures.
Fix this by using a WeakMap in SignalManager.
Closes: https://gitlab.gnome.org/GNOME/gnome-shell/-/issues/5807
Closes: https://gitlab.gnome.org/GNOME/gnome-shell/-/issues/5796
Part-of: <https://gitlab.gnome.org/GNOME/gnome-shell/-/merge_requests/2450>
We got a shiny new screenshot UI last cycle, but only relatively
obscure ways of launching it: Keyboard shortcut or overview search.
The new quick settings provides us with a natural place to expose
the functionality more prominently, and at the same time reduce
the emptiness of the top row, in particular on systems without a
battery and when locked.
Part-of: <https://gitlab.gnome.org/GNOME/gnome-shell/-/merge_requests/2439>
We will expose the screenshot UI from quick settings, including
on the lock screen. It would be odd to restrict keyboard shortcuts
more than the more accessible UI, so relax the modes for the
screenshot-ui and screen-screenshot shortcuts.
We still disable all screenshot shortcuts on the login screen, as
users don't have an obvious way to retrieve the screenshot files.
Part-of: <https://gitlab.gnome.org/GNOME/gnome-shell/-/merge_requests/2439>
We currently don't take the session mode's `hasWindows` property
into account when deciding whether window screenshots should be
allowed. Right now that doesn't matter in practice, because all
the ways to bring up the screenshot UI are blocked in those modes
anyway. This is about to change though, so take the property into
account to prevent an information leak.
Part-of: <https://gitlab.gnome.org/GNOME/gnome-shell/-/merge_requests/2439>
It is currently not possible to bring up the screenshot UI while
locked, but that is about to change.
We still don't want screencasts in that case, because they are
much easier to abuse for filling up someone else's disk.
That restriction is enforced by inhibiting remote access in the
backend, so trying to create a screencast session will fail anyway.
Still, not offering an action that is unavailable is better than
having it fail silently, so do exactly that.
Part-of: <https://gitlab.gnome.org/GNOME/gnome-shell/-/merge_requests/2439>
When we aren't showing the power toggle (read: on systems without
a battery), all items in the top are located on one side. Address
this by "moving" the spacer between "Settings" and "Screen Lock"
in that case to balance items a bit better.
Part-of: <https://gitlab.gnome.org/GNOME/gnome-shell/-/merge_requests/2439>
The quick settings code was first developed in an extension, which
meant it made sense to maintain compatibility with GNOME 42 and not
use the new :icon-name convenience property.
There is no good for sticking with that for GNOME 43 as well.
Part-of: <https://gitlab.gnome.org/GNOME/gnome-shell/-/merge_requests/2439>
Since we put the actual slider into a bin to get a proper focus
indication, the slider isn't focused anymore and its accessible object
is therefore invisible to the screen reader.
Fix this by passing the slider's accessible object to the actor
that takes the focus.
Part-of: <https://gitlab.gnome.org/GNOME/gnome-shell/-/merge_requests/2431>
NetworkManager can check if a network interface has "internet access" by
invoking a HTTP request.
The URI used for connectivity checking in NetworkManager can be configured
manually in NetworkManager.conf:
[connectivity]
uri=http://portal-check.exmaple.com/nm-check.txt
Portal Helper provides an argument to pass the URI that should be opened.
If this argument is empty it uses http://nmcheck.gnome.org as a fallback.
Pass the URI configured in NetworkManager to Portal Helper instead of
an empty string.
Fixes#1313
Part-of: <https://gitlab.gnome.org/GNOME/gnome-shell/-/merge_requests/2228>
This prevents _sync() being called after actor destruction (since actor
destruction became more reliable in mutter@3d94c7cc2) and so eliminates
this shutdown error:
```
(gnome-shell:35197): Gjs-CRITICAL **: 16:31:02.769: Object .Gjs_ui_calendar_Placeholder (0x559ed6e547e0), has been already disposed — impossible to set any property on it. This might be caused by the object having been destroyed from C code using something such as destroy(), dispose(), or remove() vfuncs.
== Stack trace for context 0x559ed6022310 ==
#0 559ed783c5a8 i resource:///org/gnome/shell/ui/calendar.js:1012 (31955be5fc90 @ 148)
#1 7ffef8f38230 b self-hosted:1178 (32af8f6b0c40 @ 454)
#2 559ed783c518 i resource:///org/gnome/shell/ui/popupMenu.js:806 (31955be18ce0 @ 52)
#3 559ed783c488 i resource:///org/gnome/shell/ui/popupMenu.js:954 (31955be190b0 @ 168)
#4 559ed783c3f8 i resource:///org/gnome/shell/ui/panelMenu.js:189 (31955be88150 @ 41)
#5 7ffef8f3de60 b self-hosted:1178 (32af8f6b0c40 @ 423)
```
Part-of: <https://gitlab.gnome.org/GNOME/gnome-shell/-/merge_requests/2429>
It is generally not possible to differentiate between systems
without bluetooth support, and systems where a bluetooth adapter
is powered down.
We work around that by tracking whether there are any set up devices,
and keep the bluetooth visible in that case, even when no adapter
is present.
However commit eeabdd150c moved updating the setting into the code
that handles adapter changes, which is exactly the place where we
carefully avoid changing the setting because it would be too
unreliable (devices may have already disappeared, or not yet
appeared).
Fix this by changing _setHadSetupDevices() to _syncHadSetupDevices()
and call that everywhere _sync() used to be called, *except* on
adapter changes.
https://gitlab.gnome.org/GNOME/gnome-shell/-/issues/5714
Part-of: <https://gitlab.gnome.org/GNOME/gnome-shell/-/merge_requests/2409>
We do set the full OSK as LTR since keymaps are defined in that
direction. Other actors inside the OSK might want differently so
move this piece of setup to init(), so child actors can set their
own without the OSK overwriting the value.
Part-of: <https://gitlab.gnome.org/GNOME/gnome-shell/-/merge_requests/2278>
This should be handled in the capture phase so containers setting
up the drag gesture have an opportunity to handle events from children.
This also follows what the 3fg swipe gesture does.
Part-of: <https://gitlab.gnome.org/GNOME/gnome-shell/-/merge_requests/2278>
Update the emoji panel so it can handle ratio changes dynamically,
and propagate the ratio from the Keyboard itself, so that the
emoji panel has a size that fits the OSK panel it was launched
from.
This is more important now with widely varying ratios, like
extended keyboards.
Part-of: <https://gitlab.gnome.org/GNOME/gnome-shell/-/merge_requests/2278>
This keymap requires the corresponding input method for Hangul
input, and the hangul mode to be enabled. Look up for the right
state, and use a corresponding 'us' keymap for english input
otherwise, in order to follow hangul IM behavior.
Part-of: <https://gitlab.gnome.org/GNOME/gnome-shell/-/merge_requests/2278>
Like OSK key buttons, we must avoid the default grabbing behavior
of StButton here. Hook to button-press-event to commit the selected
words, so we get a chance to prevent focus changes on the current
key focus.
Likewise, connect to ::touch-event to handle touch input.
Part-of: <https://gitlab.gnome.org/GNOME/gnome-shell/-/merge_requests/2278>
This mode changes the current IBus engine to ibus-typing-booster
under the rug (i.e. no changes in keyboard status menu) for any
XKB engine selected.
In order to make it useful for the currently selected language,
the typing-booster dictionary is changed to the current XKB
layout language. And since the OSK has its own emoji panel,
typing-boosters own emoji completion is disabled.
These changes only apply as long as the OSK panel is shown,
reverting to the original engine and typing-booster configuration
after it is hidden. This in theory also caters for users that
do have ibus-typing-booster enabled as an input source.
The final effect is text prediction for the language that is
being typed, according to the OSK layout, given that
ibus-typing-booster and the relevant hunspell dictionaries are
used.
Part-of: <https://gitlab.gnome.org/GNOME/gnome-shell/-/merge_requests/2278>
This action will replace CLUTTER_KEY_Backspace emission for
the OSK backspace key. Following the available mockups, implement
different modes of operation:
- Single tap deletes a single character
- Long tap starts deleting characters one by one
- Longer tap switches to word-by-word deletion
This is made possible via the input method surrounding text,
inspecting the string to look the previous char/word position
backwards, and relies on IM focus providing enough context.
Since deleting text and getting surrounding text are both
async operations, we make one happen after the other, until
the button is released.
Part-of: <https://gitlab.gnome.org/GNOME/gnome-shell/-/merge_requests/2278>
Keep it consistent with the rest of the actions. For long press
handling (i.e. shift turning to caps lock), this also means the
release action should be cancelled after any long press, to prevent
both from taking effect at the same time.
Prior to this commit, we used to switch level (and hide the button
being pressed) on button press, which made its long press handler
never get a paired release and end up triggering caps lock.
Performing the action on release ensures the shift key button does
not fall into this situation, making this issue moot.
Part-of: <https://gitlab.gnome.org/GNOME/gnome-shell/-/merge_requests/2278>
Have these defined in the JSON files themselves, instead of trying
to add them from JS while minding the differences in number of levels
and rows.
This means more redundant data in the JSON files, but simplifies
OSK layout creation significantly, and allows finer control over the
appearance without quirks.
As a result, importing data from CLDR is no longer as straightforward
as running an script. After initial import, manual editions will be
required to add missing keys, assign key widths, and so on.
Part-of: <https://gitlab.gnome.org/GNOME/gnome-shell/-/merge_requests/2278>
These actions are defined in the JSON files themselves, allowing
us to migrate away from the sets of pre/post default keys, and fold
them into the JSON files for fuller control on layout and appearance.
As a first migration step, handle the relevant actions in the buttons
created from the JSON files, so we can port these.
Part-of: <https://gitlab.gnome.org/GNOME/gnome-shell/-/merge_requests/2278>
Instead of having callers handle pressed+released, emit string
commits on a distinct signal that is emitted all at once during
release.
This also unifies the behavior of keys that have an extended keys
popup and not wrt press/release behavior and key repeat.
Part-of: <https://gitlab.gnome.org/GNOME/gnome-shell/-/merge_requests/2278>
Add distinct properties for label/icon, and commit string/keyval
actions. This makes keys figure less things on their own, allows
disociating aspect and behavior (e.g. label '↲' and keyval 0x13),
and makes the fallbacks clearer (keyval and label resorting to
commit string).
Part-of: <https://gitlab.gnome.org/GNOME/gnome-shell/-/merge_requests/2278>
We want the list to keep updating, so periodically request scans
from NetworkManager. The code follows what Settings does in its
wifi panel, including the used interval.
There's a cute little spinner in the menu header now, to indicate
an ongoing scan.
Part-of: <https://gitlab.gnome.org/GNOME/gnome-shell/-/merge_requests/2408>
Unlike the old menu that restricted almost everything on the lock
screen, we went into the completely opposite direction with quick
settings and kept everything that does not launch windows available.
Extend that line to the network items, but still respect the
`network-control` permission.
Part-of: <https://gitlab.gnome.org/GNOME/gnome-shell/-/merge_requests/2408>
When moving to quick settings, we will no longer have a single
parent we can hide instead.
This is only really needed for VPN - devices go away when networking
is disabled, connections (as in: configuration) do not - but it's
simpler to just handle this in the base class than adding a
_shouldBeVisible() method the VPN section can override.
Part-of: <https://gitlab.gnome.org/GNOME/gnome-shell/-/merge_requests/2408>
If any device is in hotspot mode, use the corresponding item as
primary. Disable the (future QuickMenuToggle) menu in that case,
and turn off the hotspot when activated rather than toggling the
global wireless switch.
Part-of: <https://gitlab.gnome.org/GNOME/gnome-shell/-/merge_requests/2408>
Wireless items represent a single adapter, but wireless connectivity
is controlled globally under NetworkManager.
So instead of delegating activation to items, bind the :checked
property to the global :wireless-enabled property and toggle it
on activate.
As any wireless devices will change their state to UNAVAILABLE
when wireless is disabled, don't remove corresponding items in
that case to keep the section visible.
We don't want to hide the button to turn Wi-Fi back on when toggled
off :-)
Part-of: <https://gitlab.gnome.org/GNOME/gnome-shell/-/merge_requests/2408>
Whether the device is used as a hotspot is currently only
used internally for the name and icon-name properties.
But hotspots need special treatment in the toggle as well,
so turn the method into a GObject property.
Part-of: <https://gitlab.gnome.org/GNOME/gnome-shell/-/merge_requests/2408>
As the sections are about to turn into quick toggles, they need
to be able to perform an action on click.
Add an activate() method for that purpose, which either disconnects
all active items, or connects the primary item.
Part-of: <https://gitlab.gnome.org/GNOME/gnome-shell/-/merge_requests/2408>
DeviceItems are sections, and therefore not actually activatable.
However when we port to quick settings, those toggles will need
to do *something*.
For that reason, provide an activate() implementation that
1. deactivates the device if currently connected
2. delegates the action to the most-recently used item,
the first visible item or the auto-connect item (in that
order)
Part-of: <https://gitlab.gnome.org/GNOME/gnome-shell/-/merge_requests/2408>
The primary indicator is a bit tricker than the VPN one: The source
of the binding can change depending on the connection, and we still
want to show it when there is a network connection we don't know
about (either because we don't handle the device type, or the
device isn't managed by NetworkManager).
Bindings still make the whole thing a lot nicer though.
Part-of: <https://gitlab.gnome.org/GNOME/gnome-shell/-/merge_requests/2408>
This is the last property that will be needed by the future
betwork quick toggles.
It maps to the same item as :icon-name, except when more than one
item is active. In that case, we overrule the binding and return
a generic name and count (like "VPN (2)").
Part-of: <https://gitlab.gnome.org/GNOME/gnome-shell/-/merge_requests/2408>
Again no big surprise, a property that will soon correspond to the
quick toggle's icon.
It is more involved than the :checked property though, which is just
a simple boolean.
To keep it as simple as possible, we set up a binding group and use
that to bind the :icon-name property.
As state changes, we then update the group's source with the item
we deem to best represent the section as a whole at the given
moment.
That is (in that order):
- the first active item
- the most recently used item
- the top-most visible item
Part-of: <https://gitlab.gnome.org/GNOME/gnome-shell/-/merge_requests/2408>
Instead of subclassing PopupMenuSection, it is now a plain GObject
that has a `menu` JS property.
That brings it a tad bit closer to QuickMenuToggle, which is another
GObject with a `menu` property.
We are on the final stretch now. Over the next couple of commits,
we'll add some (fake) properties so we can hook everything up,
and then it's finally time for the big switch.
Part-of: <https://gitlab.gnome.org/GNOME/gnome-shell/-/merge_requests/2408>
We treat wake up requests the same as user activity, as in general
the two behave the same: Turn on the screen and reset the idle watch
until the system becomes idle again.
The big exception is when the screen isn't locked yet. In that case
user activity should interrupt the automatic screen lock, but a
request to wake-up the screen (like showing a notification) should
not.
Address this by ignoring wake-up requests while the screen shield
isn't active, as we can expect the screen to still be turned on at
that point.
https://gitlab.gnome.org/GNOME/gnome-shell/-/issues/5719
Part-of: <https://gitlab.gnome.org/GNOME/gnome-shell/-/merge_requests/2413>
Now that console.debug() makes it easy to log message with DEBUG
priority, we can be a lot more generous with logging without
spamming logs (by default).
Those turned out useful in figuring out the issue in the next
commit, so let's keep them.
Part-of: <https://gitlab.gnome.org/GNOME/gnome-shell/-/merge_requests/2413>
This is a region where, if hovered while dragging, immediately goes
to the previous or next page. This behavior was lost during the
transition to the new app grid layout manager.
Bring back the drag overshoot region.
Part-of: <https://gitlab.gnome.org/GNOME/gnome-shell/-/merge_requests/2335>
This brings back the ability to drop an icon beyong the last page.
Because the acceptDrop() method does not have access to the target
drop actor, to avoid an extra pick or manually calculating it from
allocations, simply store it during DragMonitor.dragDrop(), and
use the target actor in acceptDrop().
This commit also removes the last usage of SidePages, so drop the
enum too.
Part-of: <https://gitlab.gnome.org/GNOME/gnome-shell/-/merge_requests/2335>
