(Bwarf, you used regression-release and not regression-alert... I misread, sorry.)
Anyway, support of lvm partitions is a bit flaky, I'm not sure if it depends on Thunar, gvfs or udev. For example, previously, too many volumes were shown (Bug #876823, I had to use udev rules with UDISKS_PRESENTATION_HIDE to hide them), but the code in Thunar hasn't changed much since then, so it's probably a change of behavior in gvfs/udev/something else.
If you have a machine to do some tests, you can try the new development release of thunar (1.5.0, will become 1.6.0 with Xfce 4.12) at <https://launchpad.net/~xubuntu-dev/+archive/xfce-4.12>. The sidepane and mounting code has been rewritten, so maybe your issue is fixed already. You can also try with another gtk file manager, like nautilus or pcmanfm.
(Bwarf, you used regression-release and not regression-alert... I misread, sorry.)
Anyway, support of lvm partitions is a bit flaky, I'm not sure if it depends on Thunar, gvfs or udev. For example, previously, too many volumes were shown (Bug #876823, I had to use udev rules with UDISKS_ PRESENTATION_ HIDE to hide them), but the code in Thunar hasn't changed much since then, so it's probably a change of behavior in gvfs/udev/something else.
If you have a machine to do some tests, you can try the new development release of thunar (1.5.0, will become 1.6.0 with Xfce 4.12) at <https:/ /launchpad. net/~xubuntu- dev/+archive/ xfce-4. 12>. The sidepane and mounting code has been rewritten, so maybe your issue is fixed already. You can also try with another gtk file manager, like nautilus or pcmanfm.