how about for 12.x betas?  I ahve had to move to them for other issues.

11.3 PR: https://github.com/freenas/webui/pull/4510

oh what would be the syntax to get rid of the \testing extent on my 520?

ok so i screwed up and used the \ instead of the / on the second server..let's see wht happens when i try to delete this extent via the web interface:
so the extent gets deleted in the wb interface..however it stil remains behind on the mahcine..even when told to delete it:
root@freenas:/mnt/Data # ls
\testing clones dcbackup ericb iocage iscsitesting Stuff testing
root@freenas:/mnt/Data # rm testing
root@freenas:/mnt/Data # ls
\testing clones dcbackup ericb iocage iscsitesting Stuff
root@freenas:/mnt/Data #

However I was able to get rid of it manually...which should not be necessary? also iscsitesting is another extent left behind when i deleted it from the webgui...so the middleware is not deleting extents correctly even without special characters.... I have deleted iscsitesting as well and all the other remnant targets and extents

aha..the bug is still there. I created an extent using the above mentioned syntax.,,then deleted it inside the web gui...now i have the same issue on my local freenas:
root@freenas:~ # cd /mnt/Data
root@freenas:/mnt/Data # ls
\testing clones dcbackup ericb iscsitesting Stuff
root@freenas:/mnt/Data # rm /testing
rm: /testing: No such file or directory