QStorageInfo does not show FUSE mounts anymore

Hi,

I've found aout that the qstorageinfo has changed recently. I'v got a
fuse filesystem and a qt gui using that filesystem. To detect the
mountpoint the gui uses QStorageInfo::mountedVolumes() and walk this
list.

This worked until recently, now the fuse is not found anymore. I've
found out that the function
isPseudoFs has been changed, and every fs where the device does not
start with a slash is a pseudofs. Huhhh? This is far too strict.

The manpage of mount describes for the device (or source):

mount() attaches the filesystem specified by source (which is often a
device name, but can also be a directory name or a dummy) to the
directory specified by target.

So there are no restrictions here it has to start with a slash. And
the source -can- be something abstract, and not a device.

Much much better would be a the use of filters simular to the QDir::entryInfoList.
Suggestion:
QStorage::All
QStorage::Devices
QStorage::Pseudo
etc

This leaves the programmer using this the freedom what to list.
And maybe the name storageinfo is a bit misleading here, QFilesystemsInfo would be better.

Stef

https://codereview.qt-project.org/#/c/141217/
http://fossies.org/diffs/qt-everywhere-opensource-src/5.6.0_vs_5.6.1/qtbase/src/corelib/io/qstorageinfo_unix.cpp-diff.html