Since kwin runs as a normal user, it cannot create the X11 connection
socket directory because any user process can easily compromise the
security of the system by unsetting the sticky bit.
In order to guarantee the security of the system, the socket directory
must be created by root and have the sticky bit on.
Xwayland starts listening to -listenfd file descriptors after the WM_S0
selection is claimed. At the moment, it is claimed asynchronously by
kwin. First, we create a dummy window and change one of its properties
to get the timestamp. After the timestamp has been received, we actually
call xcb_set_selection_owner().
This provides kwin greater control over how X11 sockets are created for
Xwayland. For example, it can be used to ensure that the DISPLAY remains
the same across Xwayland server restarts or launching Xwayland on
demand.
Even though -listen <fd> option is deprecated, we still pass it because
older versions of Xwayland may not have the -listenfd option.
This renames updateXauthorityFile to writeXauthorityEntries as it doesn't
actually update (i.e. change) anything, it just writes new ones.
Error handling is introduced, to avoid that it continues silently without
entries, which would cause all connections to fail.
Once in a while, we receive complaints from other fellow KDE developers
about the file organization of kwin. This change addresses some of those
complaints by moving all of source code in a separate directory, src/,
thus making the project structure more traditional. Things such as tests
are kept in their own toplevel directories.
This change may wreak havoc on merge requests that add new files to kwin,
but if a patch modifies an already existing file, git should be smart
enough to figure out that the file has been relocated.
We may potentially split the src/ directory further to make navigating
the source code easier, but hopefully this is good enough already.
