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In C++20 there are new classes that have member functions named emit().
c.f.:
https://lists.qt-project.org/pipermail/development/2020-February/038812.html
https://en.cppreference.com/w/cpp/io/basic_osyncstream/emit

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Overlay fs are ignored as long as they are not mounted at '/' i.e a
livesystem, or by the user.

BUG: 422385
FIXED-IN: 5.78

NO_CHANGELOG

BUG: 411772
FIXED-IN: 5.77

The libraries are versioned now

This commit introduces support for sshfs as network filesystem.
It's probably used enough to warrant the inclusion.

pkg_check_modules looks for all modules in arguments whereas
pkg_search_module stops when a match is found.

We're only looking for one plist pkgconfig file which may have
different name.

Add an API-version definition to consumers of the imobiledevice
imported target. The definition is not very fine-grained, but
right now it's enough to distinguish "1.3.0" from "not-1.3.0"
releases. A better approach would unpack the version string
returned from pkg-config into suitable hex values.

The value of IMOBILEDEVICE_API is a (hex) constant consisting
of (major<<16)|(minor<<8)|patch, in order to be compatible
with QT_VERSION_CHECK, so 1.3.0 becomes 0x10300.

In the imobiledevice backend, restore the code that does
nothing with DEVICE_PAIRED, but now protect it with versioning
`#ifdefs` and restore the unhandled-event warning.

This enum value is effectively unused, so remove it for now.
Replace it by a version check in the future.

This allows Solid to find them and exposes them as PortableMediaPlayer with
known protocol "afc" similar to how it's done for MTP devices.
Devices get the device name and form factor icon. It also monitors pluggin in
and out devices.

Battery is not provided as UPower already reports this through libimobiledevice.
Also, there's no way for Solid to relate devices from different backends
so iPhones still also show up as PTP camera.

Right now it doesn't do much (apart showing up in `solid-hardware5 list`
and KInfoCenter's device browser) but this is preparing the necessary
infrastructure for improving iOS support throughout KDE.
Signed-off-by: Eike Hein <eike.hein@mbition.io>

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Having the macro's definition of the operator| in the namespace of the
flags argument improves/unbreaks things for the argument-dependent
lookup of unqualified function names, e.g. when flags are combined in
calls of other methods, but there is some other operator| defined in the
namespace of the current code.

Given Q_DECLARE_OPERATORS_FOR_FLAGS creates inlined functions, this
should be a source and binary compatible change.

Qt did similar for Qt 5.12 in
https://codereview.qt-project.org/c/qt/qtbase/+/225348