If the output we’re mapped on is disabled (or disconnected), the
compositor will unmap us.
Up until now, our response was to simply shutdown.
Now, we destroy the surface, remove all pending rendering buffers, and
all further calls to commit() will return immediately, without doing
anything.
If the user has configured a specific monitor to use, we wait for that
output to come back. When it does, we re-create the layer surface and
then we’re up and running again.
Bars running on the “default” monitor are handled in a similar
way. Since we don’t have an output name from the configuration, we
instead store the name of the output we were mapped on, when we’re
either unmapped from that output, or that output global is destroyed.
As soon as we see that output come back, we re-create the layer
surface.
Audio CDs are special, in that they don’t (usually) have any data
partitions. They also don’t have a volume label. They just have
tracks.
Before this patch, we ignored all optical mediums that did *not* have
a filesystem (that includes audio CDs).
Now, instead of using the ID_FS_USAGE property to determine whether
there’s media present in the CD-ROM or not, we use the
ID_CDROM_MEDIA. This property is set to ‘1’ for both audio CDs and
data CDs.
Then, we read the ID_CDROM_MEDIA_TRACK_COUNT_AUDIO property to
determine how many audio tracks there are.
If the CD has a filesystem, we treat it as a data CD, and use the
already existing add_partition() function to track it.
If the CD does _not_ have a filesystem, but it _does_ have at least
one audio track, we treat it as an audio CD and use the new
add_audio_cd() function to track it.
This function is almost identical to add_partition(), but instead of
reading the ID_FS_LABEL property, it reads the
ID_CDROM_MEDIA_TRACK_COUNT_AUDIO property and synthesizes a label on
the form “Audio CD - N tracks”.
Finally, a new boolean tag, “audio”, has been added. It is set to true
for audio CD “partitions”, and to false in all other cases.
Set to true for empty (no windows) workspaces.
Mostly useful with persistent workspaces, to be able to differentiate
between invisible non-empty workspaces and actually empty
workspaces (the latter not being possible with non-persistent
workspaces).
