The framerate for screen cast sources was set to variable within 1 FPS
and the framerate of the monitor being screen casted. This meant that if
the sink didn't match the framerate (e.g. had a lower max framerate),
the formats would not match and a stream would not be established.
Allow letting the sink clamp the framerate range by setting it as
'unset', allowing it to be negotiated.
The PipeWire master branch saw some backports from the work branch,
including API changes making the 0.1 series more aligned with future
plans. Make mutter use the new API. This is needed to avoid dead locks
that existed in the older version.
xdg-foreign clears the `transient_for` of a modal dialog when its
imported parent is destroyed, which would later cause a crash in
`constrain_modal_dialog()` because the transient `NULL`.
So in case a modal dialog has no parent, do not try to constrain it
against its parent.
Closes: https://gitlab.gnome.org/GNOME/mutter/issues/174
The test fix in commit 859bea629b broke distcheck, probably because
abs_srcdir is prefixed with a relative $BUILDROOT. Hopefully this is
the last autotools breakage before switching to meson, so don't
bother investigating too much ...
Force update the cursor renderer after theme or size changes; otherwise
we'll be stuck with the old theme and/or size until something else
triggers resetting of the cursor.
MetaDisplay still had workspace signals, but nothing emitted them,
meaning we wouldn't get warnings if handlers were added there instead
of to MetaWorkspaceManager.
https://bugzilla.gnome.org/show_bug.cgi?id=759538
If we wait with opening the X11 window decoration GDK connection, we
might end up with a terminated X11 server before we finish
initializing, depending on the things happening after spawning Xwayland
and before opening the MetaX11Dispaly. In gnome-shell, this involves
e.g. creating a couple of temporary X11 connections, and on disconnect,
if they happen to be the last client, the X server will terminate
itself.
https://bugzilla.gnome.org/show_bug.cgi?id=759538
Under Xorg the cursor size preference was pre-scaled originating from
gtk, while with Wayland it came directly from GSettings remaining
unscaled. Under Xwayland this caused the X11 display code to set the
wrong size with HiDPI configurations, which was often later overridden
by the equivalent code in gtk, but not always.
Fix this by always having the cursor size preference unscaled, scaling
the size correctly where it's used, depending on how it's used.
https://bugzilla.gnome.org/show_bug.cgi?id=759538
GTK+ won't be initialized if X11 is not available
Instead, when setting gtk-shell-shows-app-menu,
meta_prefs_set_show_fallback_app_menu should be
called as well.
https://bugzilla.gnome.org/show_bug.cgi?id=759538
Allow removing a prefs handler that was already removed. This allows us
to remove prefs from the dispose function without having to keep track
of it in every place.
- Stop using CurrentTime, introduce META_CURRENT_TIME
- Use g_get_monotonic_time () instead of relying on an
X server running and making roundtrip to it
https://bugzilla.gnome.org/show_bug.cgi?id=759538
This moves following objects from MetaScreen to MetaDisplay
- workareas_later and in_fullscreen_later signals and functions
- startup_sequences signals and functions
- tile_preview functions
https://bugzilla.gnome.org/show_bug.cgi?id=759538
Split X11 specific parts into MetaX11Display. This also required
changing MetaScreen to stop listening to any signals by itself, but
instead relying on MetaDisplay forwarding them. This was to ensure the
ordering. MetaDisplay listens to both the internal and external
monitors-changed signal so that it can pass the external one via the
redundant MetaDisplay(prev MetaScreen)::monitors-changed.
https://bugzilla.gnome.org/show_bug.cgi?id=759538
They are X11 specific functions, used for X11 code. They have been
improved per jadahl's suggestion to use gdk_x11_lookup_xdisplay and
gdk_x11_display_error_trap_* functions, instead of current code.
https://bugzilla.gnome.org/show_bug.cgi?id=759538
- Moved xdisplay, name and various atoms from MetaDisplay
- Moved xroot, screen_name, default_depth and default_xvisual
from MetaScreen
- Moved some X11 specific functions from screen.c and display.c
to meta-x11-display.c
https://bugzilla.gnome.org/show_bug.cgi?id=759538
These files are used to run mutter-test tools and using relative
paths won't work if the builddir doesn't match the srcdir.
This won't affect their installation (in case the build option is passed)
Make it so that each logical monitor has a reference to all the
monitors that are assigned to it.
All monitors has a reference to each output that belongs to it.
Each output has a reference to any CRTC it has been assigned.
https://bugzilla.gnome.org/show_bug.cgi?id=786929
For some reason "backends: Remove X11 idle-monitor backend" removed
unrelated warning messages for when generated monitor configurations
that should work didn't, which also made the unit tests fail.
This commit adds them back, which also makes the tests pass again.
Commit 22723ca37 moved buffer realization to
meta_wayland_surface_commit() so that it wouldn't be part of
meta_wayland_buffer_attach().
However, creation of dmabuf buffers would call into
meta_wayland_buffer_attach() directly without realizing the buffer
first. attach() would then fail and mutter would effectively shut down
any clients using the zwp_linux_dmabuf protocol (note that if such
client was Xwayland, mutter itself would shut down as well).
Add the missing bit in order to make zwp_linux_dmabuf protocol work
again.
One of the current limitations of EGLStreams is that there's no way to
resize a surface consumer without re-creating the entire stream.
Therefore, while resizing, clients will send wl_surface::attach requests
so the compositor can re-create its endpoint of the stream, but no
buffer will be available actually. If we proceed with the rest of the
attach operation we'll be presenting an empty buffer.
In order to fix this, a separate wl_eglstream_controller protocol has
been introduced that clients can use to request a stream re-creation
without overloading wl_surface::attach for that purpose.
This change adds the required logic to create the corresponding
wl_eglstream_controller global interface that clients can bind to.
Whenever a client requests a stream to be created, we just need to
create and realize the new EGLStream buffer. The same buffer resource
will be given at a later time to wl_surface::attach, whenever new
content is made available by the application, so we can proceed to
acquire the stream buffer and update the surface state.
https://bugzilla.gnome.org/show_bug.cgi?id=782575
Clients using EGLStream-backed buffers will expect the stream to be
functional after wl_surface::attach(). That means the compositor-side
stream must be created and a consumer attached to it.
To resolve the above, this change realizes buffers even when the attach
operation is deferred (e.g. synchronized subsurfaces).
https://bugzilla.gnome.org/show_bug.cgi?id=782575
When dealing with synchronized subsurfaces, we defer buffer attachments
until the parent surface state is applied.
That causes interaction issues with EGLStream backed buffers, as the
client expects the compositor-side stream to be functional after it
requests a wl_surface::attach.
By allowing the compositor to realize buffers without attaching them, we
could resolve the issue above if we define a realized EGLStream buffer
as a functional EGLStream (EGLStream + attached consumer).
This change moves the texture consumer creation part from the attach
function to the realize one.
https://bugzilla.gnome.org/show_bug.cgi?id=782575
Commit 712ec30cd9 added the logic to only
choose EGL configs that match the GBM_FORMAT_XRGB8888 pixel format.
However, there won't be any EGL config satisfying such criteria for
non-GBM backends, such as EGLDevice.
This change will let us choose the first EGL config for the EGLDevice
backend, while still forcing GBM_FORMAT_XRGB8888 configs for the GBM
one.
Related to: https://gitlab.gnome.org/GNOME/mutter/issues/2
Where to realize a hardware cursor depends on where on the screen it
will be displayed. For example it only needs buffers for the cursor
plane on a certain GPU if it overlaps with a monitor that is connected
said GPU.
Previously, we were too eager with uploading the cursor plane buffers,
which in effect resulted in the secondary GPU always being woken up
when changing the cursor, even though the cursor plane would actually
never be set unless the pointer cursor was moved to a monitor connected
to the secondary GPU. These wake-ups caused noticable stuttering; thus
by uploading the buffers more lazilly, the stuttering is avoided.
Closes: https://gitlab.gnome.org/GNOME/mutter/issues/77
When a cursor is hidden, the native backend will properly hide the HW
cursor sprite as well, but it would communicate this as if the cursor
was not handled by the backend, while in fact it still was. This caused
the generic cursor rendering layer to queue a redraw.
https://gitlab.gnome.org/GNOME/mutter/issues/77
When force-updating the HW state we might end up with a situation where
the HW cursor is no longer usable. If this would happen, we'd before
this commit not trigger the fallback paths using a GL texture.
https://gitlab.gnome.org/GNOME/mutter/issues/77
It is already handled by the monitor-updated-internal signal handler in
meta-cursor-renderer-native.c, which will always be called indirectly
by resuming the monitor manager.
While at it, remove a useless comment.
https://gitlab.gnome.org/GNOME/mutter/issues/77
Call it meta_cursor_renderer_update_cursor. This avoids confusing it
with the update_cursor MetaCursorRendererClass vfunc when navigating
the file.
https://gitlab.gnome.org/GNOME/mutter/issues/77
It knows better when it's needed. For now, just do it just as before,
before drawing. Eventually, we can conditionalize where to realize
depending on the cursor sprite position.
https://gitlab.gnome.org/GNOME/mutter/issues/77
Use a common entry point into the cursor renderer implementations HW
cursor realization paths for all cursor sprite types. This is in
preparation for realizing at more strategic times.
https://gitlab.gnome.org/GNOME/mutter/issues/77
The end goal here is to being able to realize at any point in time
through a single API, so start by moving state into the cursor sprite
implementation.
https://gitlab.gnome.org/GNOME/mutter/issues/77
Remove some X11 compositing manager specific code from the general
purpose cursor tracker into a new MetaCursorSprite based special
purpose XFIXES cursor sprite.
https://gitlab.gnome.org/GNOME/mutter/issues/77
Introduce a new type MetaCursorSpriteXcursor that is a MetaCursorSprite
implementation backed by Xcursor images. A plain MetaCursorSprite can
still be created "bare bone", but must be manually provided with a
texture. These usages will eventually be wrapped into new
MetaCursorSprite types while turning MetaCursorSprite into an abstract
type.
https://gitlab.gnome.org/GNOME/mutter/issues/77
It was prefixed with meta_cursor_, but it took a X11 Display, so update
the naming. Eventually it should be duplicated depending if it's a
frontend X11 connection call or a backend X11 connection call and moved
to the corresponding layers, but let's just do this minor cleanup for
now.
https://gitlab.gnome.org/GNOME/mutter/issues/77
This makes it possible to move out backing store specific code (such as
Xcursor handling) to separate units, while also making it easier to add
more types).
https://gitlab.gnome.org/GNOME/mutter/issues/77
Rename the two cursor role types according to the convention used by the
other roles. This means that MetaWaylandSurfaceRoleCursor was renamed to
MetaWaylandCursorSurface, and MetaWaylandSurfaceRoleTabletCursor was
renamed to MetaWaylandTabletCursorSurface. The corresponding filenames
were renamed accordingly too.
https://gitlab.gnome.org/GNOME/mutter/issues/77
drmModeAddFB2 allows userspace to specify a real format enum on
non-ancient kernels, as an improvement over the legacy drmModeAddFB
which derives format from a fixed depth/bpp mapping.
As an optimisation, Weston used to decide at the first failure of
drmModeAddFB2 that the ioctl was unavailable: as non-existent DRM
ioctls return -EINVAL rather than -ENOSYS or similar, bad parameters are
not distinguishable from the ioctl not being present.
Mutter has also implemented the same optimisation for dumb framebuffers,
which potentially papers over errors for the gain of avoiding one ioctl
which will rapidly fail on ancient kernels. Remove the optimisation and
always use AddFB2 where possible.
Closes: #14
And ensure the actor is no longer reactive even though it might live longer
because of close effects, GCs, and whatnot. This ensures the actor is not
eligible for pointer picking within the destruction of its surface.
Closes: #188
The MetaCloseDialog implementation object may stay artifically alive
for a longer period. This was usually fine till gnome-shell commit
b03bcc85aad, as the check_alive() timeout will keep running even
though the window went unmanaged/destroyed, leading to crashes.
In order to fix this, forcibly hide the dialog if it is visible and
the window is being unmanaged, so the timeout is stopped in time.
The order of role creation is undetermined, so we can't account that
the parent surface will have a role (and an actor) at the time of
creating the wl_subsurface role for a child surface.
So we must do it both ways, add the subsurface as a child on
get_subsurface() if the parent already got a role, and lazily add
child subsurface actors to the current one if the parent surface got
it at a later point.
Related: #132
When using the EGLStream backend, the MetaRendererNative passed a
GClosure to KMS when using EGLStreams, but KMS flip callback event
handler in meta-gpu-kms.c expected a closure wrapped in a closure
container, meaning it'd instead crash when using EGLStreams. Make the
flip handler get what it expects also when using EGLStreams by wrapping
the flip closure in the container before handing it over to EGL.
https://bugzilla.gnome.org/show_bug.cgi?id=790316
Commit 47131b1d ("frames: Handle touch events") introduced an assert to
make sure that all mouse button actions are handled in mutter.
However, mice can have a more than 5 buttons, so simply ignore the
"other" actions instead of aborting.
Fixes: https://gitlab.gnome.org/GNOME/mutter/issues/160
After 20176d03, the Wayland backend only synchronizes with the
compositor after a geometry was set, and it was different from
the current geometry.
That commit was mistakenly comparing the geometry before chaining
up, which would yield a false negative on the case where the
client didn't call set_geometry() before commit().
Fix that by caching the old geometry locally, chain up (and thus
apply the new geometry rectangle), then comparing the old and
current geometry rectangles.
Fixes https://gitlab.gnome.org/GNOME/mutter/issues/150
This avoids overwhelming the GPU with trying to update mipmaps at a high
rate. Because doing so could easily cause a reduction in the compositor
frame rate and thus actually reduce visual quality.
In the case of a window that is constantly animating in the overview,
this reduces mutter's render time by around 20%-30%.
This is just done on wayland as it'll break horribly on X11, we let
this happen through pointer emulated events in XISelectEvents evmask
instead.
Some things had to be made slightly more generic to accomodate touch
events. The MetaFrames shall lock onto a single touch at a time, we
don't allow crazy stuff like multi-window drag nor multi-edge resizes.
https://bugzilla.gnome.org/show_bug.cgi?id=770185
While MetaStage, MetaWindowGroup and MetaDBusDisplayConfigSkeleton don't
appear explicitly in the public API, their gtypes are still exposed via
meta_get_stage_for_screen(), meta_get_*window_group_for_screen() and
MetaMonitorManager's parent type. Newer versions of gjs will warn about
undefined properties if it encounters a gtype without introspection
information, so expose those types to shut up the warnings.
https://bugzilla.gnome.org/show_bug.cgi?id=781471
Various code assumed PipeWire function calls would never fail. Some can
actually fail for real reasons, and some currently can only fail due to
OOM situations, but we should still not assume that will always be the
case.
https://gitlab.gnome.org/GNOME/mutter/merge_requests/102
The destroyed signal that was emitted if an imported surface was not
available when created, for example if the handle was invalid or
already unexported, was emitted on the wrong resource.
To check if a subsurface is effectively synchronized, we walk the
subsurface hierarchy to look for a non-subsurface parent or a subsurface
being synchronized.
However, when client is closing, the parent surface might already be
gone, in which case we end up with a surface being NULL which causes a
NULL pointer dereference and a crash.
Check if the parent surface is NULL to avoid the crash, and consider
it's already synchronized if it is NULL to avoid further updates.
Fixes: https://gitlab.gnome.org/GNOME/mutter/issues/124
The current implementation of the XdgSurface v6 protocol does not check
if the window changed before calling meta_window_wayland_move_resize().
The problem with this approach is that calling this function is a costly
operation since we enter the compositor side. In GNOME Shell case, it is
in JavaScript, which triggers a GJS trampoline. Calling this function on
every mouse movement is naturally as terrible as it could be - and is
exactly what happens now.
This commit adds the necessary checks to only call move_resize() when
the window actually changed, or when it needs to be updated.
https://bugzilla.gnome.org/show_bug.cgi?id=780292
Issue: #78
This will be used by the next commit to determine when a window
geometry change should be ignored or not. Normally, it would be
enough to just check if the position and sizes changed.
The position, in this case, is relative to the client buffer, not
the global position. But because it is not global, there is one,
admitedly unlikely, situation where the window state is updated
while the client size and relative positions don't change.
One can trigger this by e.g. tiling the window to the half-left of
the monitor, then immediately tile it to half-right. In this case,
the window didn't change, just it's state, but nonetheless we need
to notify the compositor and run the full move/resize routines.
When that case happens, though, the MetaWindowWayland is tracking
the pending state change or a move. And this is what we need to
expose.
https://bugzilla.gnome.org/show_bug.cgi?id=780292
Issue: #78
In the old, synchronous X.org world, we could assume that
a state change always meant a synchronizing the window
geometry right after. After firing an operation that
would change the window state, such as maximizing or
tiling the window,
With Wayland, however, this is not valid anymore, since
Wayland is asynchronous. In this scenario, we call
meta_window_move_resize_internal() twice: when the user
executes an state-changing operation, and when the server
ACKs this operation. This breaks the previous assumptions,
and as a consequence, it breaks the GNOME Shell animations
in Wayland.
The solution is giving the MetaWindow control over the time
when the window geometry is synchronized with the compositor.
That is done by introducing a new result flag. Wayland asks
for a compositor sync after receiving an ACK from the server,
while X11 asks for it right away.
Fixes#78
Before we just set it to "none", but this was not enough since various
calls will depend on not just the context being active, but the main
rendering surface.
Fixes https://gitlab.gnome.org/GNOME/mutter/issues/21
When deriving the global scale directly from the current hardware state
(as done when using the X11 backend) we are inspecting the logical
state they had prior to the most recent hot plug. That means that a
primary monitor might have been disabled, and a new primary monitor may
not have been assigned yet.
Stop assuming a primary monitor has an active mode before having
reconstructed the logical state by finding some active monitor if the
old primary monitor was disabled. This avoids a crash when trying to
derive the global scale from a disabled monitor.
Closes: https://gitlab.gnome.org/GNOME/mutter/issues/130
These paths implicitly relied on the forwarded IM key events having
a source_device backed by a real HW device. This assumption is no
longer held true since commit b5328c977.
Explicitly check the INPUT_METHOD flag so they are handled as they
should despite not being "real HW" events.
As a follow up to the patch from a95cbd0a, we need to make sure
that the pointer is out of the way as well when monitors changed,
since that's the event that will prevail in some cases. Besides,
this is also consistent with what the code before a95cbd0a was,
which initialized the pointer position in the same way both in
this case and in the real_post_init() function.
Closes: https://gitlab.gnome.org/GNOME/gnome-shell/issues/157
We used to maintain an actor for cursors, even though we would possibly
use hw overlays or even some other overlay actor for those. This happens
no more, so check whether we are dealing with an actor-backed surface role
before fiddling with it.
All surface roles that do need a backing actor inherit from this
class, it makes sense to move actor management there. This also
means the MetaWaylandActorSurface is in charge of emitting
::geometry-changed on the MetaWaylandSurface.
Instead of scheduling a meta_later, keep track of the unassociated
windows, and look for matches as soon as the MetaWaylandSurface is
created on our side.
This will ensure the surface is given the Xwayland role before receiving
the first wl_surface.commit.
In the synchronized subsurface case, the destination list may
contain other elements from previous wl_surface.commit calls.
Resetting the list will leave those dangling frame callbacks
that will lead to invalid writes when those get to be destroyed
(eg. on client shutdown).
Gtk now is caching the themed cairo surfaces, then as per
commit gtk@e36b629c the surface device scale is used to figure
out the current paint scaling.
Without this when using background-image's for window buttons
the -gtk-scaled icons isn't properly resized.
Fixes#99
Centering the pointer at startup causes undesired behaviour if
it ends up hovering over reactive elements, that might react
to that positioning, causing confusion. This is the case of
the login dialog when a list of different users is shown, as
centering the pointer at startup in that case will get the
user in the center of the screen pre-selected, which is not
the expected behaviour (i.e. pre-selecting the first one).
Fix this by simply moving the pointer out of the way, close
to the bottom-right corner, during initialization.
Closes: https://gitlab.gnome.org/GNOME/gnome-shell/issues/157
Right now if Xwayland crashes, we crash, too.
On some level that makes sense, since we're supposed to control the
lifecycle of Xwayland, and by it crashing we've lost that control.
But practically speaking, the knock-on crash adds noise to the logs,
bug trackers, and retrace servers that only makes debugging harder.
And the crash isn't something mutter can "fix", since it's
ultimately from a bug in Xwayland anyway.
This commit makes mutter exit instead of crash if Xwayland goes away
unexpectedly.
Right now we explicitly g_clear_error any error we find, but that
makes it tricky to return early from the function, which a
subsequent commit will want to to do.
This commit switches GError to use g_autoptr so the error clearing
happens automatically.
This is a small mistake spotted while working on a solution
for #77. When a GPU fails to initialize, we're adding them
anyway, which might have pretty bad consequences when trying
to use these NULL GPUs.
Issue: #77
Make it re-enable:able by a hidden "experimental feature". To enable, add
"kms-modifiers" to the org.gnome.mutter.experimental-features GSettings entry.
The ResetIdletime API can be used instead of an "XTest" binary to
programmatically reset the idle time, as if the user pressed a button on
a keyboard.
This is necessary since we stopped using the XSync extension to monitor
idletimes, as it didn't consider inhibitors as busy, and mutter's
clutter code ignores "Core Events" as generated by XTest.
This patch will require minimal changes to gnome-settings-daemon's power
test suite so that "key press" idletime resets are triggered through
this D-Bus interface rather than through XTest and a roundtrip through
the X server.
https://bugzilla.gnome.org/show_bug.cgi?id=705942
Take idle inhibitions into account for when to fire idle watches as
requested by OS components.
This should stop gnome-session and gnome-settings-daemon considering
the session idle when they have been inhibited for longer than their
timeout, for example to avoid the screensaver activating, or the
computer suspending after watching a film.
https://bugzilla.gnome.org/show_bug.cgi?id=705942
Now that we've removed the X11 specific backend of the idle monitor,
add back a cut-down version of it for the explicit purpose of being
told about idle time resets when XTest events are used.
XTest events are usually used by test suites and remote display software
to inject events into an X11 session. We should consider somebody moving
the mouse remotely to be just as "active" as somebody moving it locally.
https://bugzilla.gnome.org/show_bug.cgi?id=705942
And use the old "native" backend for both X11 and Wayland. This will
allow us to share fixes between implementations without having to delve
into the XSync X11 extension code.
https://bugzilla.gnome.org/show_bug.cgi?id=705942
When moving the pending state of an effectively synchronized subsurface
so it is applied together with the parent, perform a merge of the source
MetaWaylandPendingState into the destination one, instead of simply
overwriting the struct.
The other approach had 2 kind of leaks, one that would happen everytime
a wl_surface.commit happens on a sync subsurface (both surface/buffer
damage regions are leaked). The other more unlikely one would apply on
the rest of pending state data, happening whenever the compositor gets
>1 wl_surface.commit calls on the subsurface before the parent surface
gets its own.
The function has also been renamed to use the more descriptive "merge"
term.
Related: gnome-shell#64
Output ID is set equal to 'i' later in the loop. But 'i' was never
incremented, so all outputs were getting the same ID (equal to
the number of CRTCs, because 'i' was reused from the previous loop).
(cherry picked from commit 23c3f8bb18)
Compositor effects change the actor size and position, which can lead to
inconsistent output enter/leave notifications, leaving clients' surfaces
without any output set.
Update output enter/leave notifications after all compositor effects are
completed so that we give clients accurate output location.
Closes: https://gitlab.gnome.org/GNOME/mutter/issues/104
When using plugins, the effects will affect the MetaWindowActor size
and position.
Add a new signal "effects-completed" wired to the corresponding
MetaWindowActor which is emitted when all effects are completed so that
derived objects can be notified when all effects are completed and use
the actual size and position.
Closes: https://gitlab.gnome.org/GNOME/mutter/issues/104
If we attempt GBM surface allocation with a set of modifiers but the
allocation fails, fall back to non-modifier allocations. This fixes
startup on Pineview-based Atom systems, where KMS provides us a set of
modifiers but the GBM implementation doesn't support modifier use.
Closes: https://gitlab.gnome.org/GNOME/mutter/issues/84
Rotating an output would show duplicate cursors when the pointer is
located over an area which would be within the output if not rotated.
Make sure to swap the width/height of the output when rotated.
Closes: https://gitlab.gnome.org/GNOME/mutter/issues/85
Rendering the next frame (which mostly happens as part of the flush done
in swap buffers) is a task that the GPU can complete independently of
the CPU having to wait for previous page flips. So reverse their order
to get the GPU started earlier, with the aim of greater GPU-CPU
parallelism.
When using two monitors size by side with different scales, once the
cursor moves from one output to another one, its size changes based on
the scale of the given output.
Changing the size of the cursor can cause the cursor area to change
output again if the hotspot is not exactly at the top left corner of the
area, causing the texture of the cursor to change, which will trigger
another output change, so on and so forth causing continuous surface
enter/leave event which flood the clients and eventually kill them.
Change the logic to use only the actual cursor position to determine if
its on the given logical monitor, so that it remains immune to scale
changes induced by output scale differences.
Closes: https://gitlab.gnome.org/GNOME/mutter/issues/83
