Old code was fundamentally broken, fixes now are:
- free the MDs current device classes
- copy the device classes instead of flipping the pointers
- check for the old MD, not the new one.
Sometimes (e.g. on my debian ppc box) maxKeysPerModifier of the SD is 0. So we
try to malloc(0), bringing the whole server down with a FatalError because it
looks as if the malloc failed. This is bad, so only alloc if we actually have
something to alloc.
Anything in dev->key, dev->valuator etc. of a MD must always be a copy of the
original class. The intial classes of an MD (the ones set up before an SD is
attached) as well, as we may have to restore them if no SD is attached
anymore.
Turns out it's really really hard synchronising device state across multiple
duplicated events if they all share the same struct. So instead of doing so,
when the SD changes deep-copy all it's classes into the MD. The MD then has
the same capabilities, but the state can be set separately. This should fix
xkb, key state, repeat etc. problems.
Updating the device state allows us to remove the SwitchCoreKeyboard from the
event gathering, it's all done during event processing now.
The master needs to have the same devPrivate as the slave, in case a client
issues a request that goes down to the driver.
Example: if a driver wants to ring the keyboard bell, it'll pick a keyboard.
The KeyClassPtr will direct it to the matching method in the driver, but
because the MD doesn't have the devPrivate set the driver segfaults.
Even if all drivers were updated to not dereference the nullpointer, nothing
would actually ever happen.
To avoid this, we flip the master's public.devPrivate to the last SDs
devPrivate.
POE now only deals with processing the event and calling the appropriate
delivery methods. Actually modifying the device state is done in
UpdateDeviceState. This separation should make it easier to avoid setting the
state twice when master events are processed.
If a slave device is attached to a master device, then we need to send a
mapping notify to the client.
Mapping notify needs to be sent if
- different slave device but on same master
- different master
This gives you funny behaviour with the ClientPointer. When a
MappingNotify is sent to the client, the client usually responds with a
GetKeyboardMapping. This will retrieve the ClientPointer's keyboard mapping,
regardless of which keyboard sent the last mapping notify request. So
depending on the CP setting, your keyboard may change layout in each app...
Haven't quite figured out yet how to make these repeats work. Because we share
the class between devices, the key state is already set when we process the
master device's event, causing a repeat on each event.
Upon recreation of the RandR internal data structures in RRCrtcNotify() the
crtc of an output could be NULLed if the crtc was shared (cloned) between two
outputs and one of them got another crtc assigned.
This can happen if we check for a passive core grab and our device is a
floating slave device. Doesn't really change anything as SDs can't send core
events but it stops the server from segfaulting.
Each time a different slave device sends through a master, an
DeviceClassesChangedEvent is enqueued. When this event is processed, all
classes of the matching master device are changed, and the event is sent to
the clients.
Next time the master is queried, it thus shows the evclasses of the last slave
device. The original classes are stored in the devPrivates.
TODO: if all slave devices are removed, the master's original classes need to
be restored.
at CodeWeavers for the patch. From his description:
Fix a display bug with the X server. The Generic Rootless extension
installs overrides for certain GC (graphics context) operations. Within
these overrides, they temporarily uninstall themselves, perform their work,
and then reinstall themselves. Except sometimes they would return early
and wouldn't reinstall themselves when they should. Now they do in all cases.
Fix a bug in RootlessCopyWindow where early returns could leave the screen's
dispatch table entry for CopyWindow unwrapped. We think that this is
another case (hopefully the last) of the rootless drawing bug.
