If most of your windows are sandboxed applications, your bar looks like:
[Sandbox sandbo..] [Sandbox sandbo..] [Sandbox sandbo..]
and it is hard to find a specific application.
example of a current Xephyr title:
Sandbox sandbox_web_t:s0:c112,c991 -- /usr/bin/firefox
with the modification in the attached patch titles will look like:
and it should be easier to find a specific application.
In addition to the type I would find it handy to also include the
DISPLAY in the title (needed when using xsel for copy'n paste).
The second patch only adds '-nolisten tcp' to Xephyr, but if there are
use cases where one needs Xephyr to open a listener this patch will
btw: secon's manpage doesn't contain the '-l' option.