This is not needed, because only a symbol to create the KPluginFactory
instance must be exported. The KPluginFactory macros or rather the underlying
Q_PLUGIN_METADATA macro already take care of that.
In other plugin code of KDE, we also do not export classes.
The size of the generated plugin files is nearly identical, but removing
the macros avoids confusion for developers.
IAudioEndpointVolumeCallback::Release was called in callback functions of IMMNotificationClient (through the call to SystemvolumePlugin::sendSinkList), however https://docs.microsoft.com/en-us/windows/win32/api/mmdeviceapi/nn-mmdeviceapi-immnotificationclient points out that:
*To avoid dead locks, the client should never call IMMDeviceEnumerator::RegisterEndpointNotificationCallback or IMMDeviceEnumerator::UnregisterEndpointNotificationCallback in its implementation of IMMNotificationClient methods.
*The client should never release the final reference on an MMDevice API object during an event callback.
So I moved that part of code to another thread so it will successfully run after callback functions work out and call only if endpoint needs to be released (device was removed), so it won't spawn new thread for every generated event
Summary: I've added Windows support to the systemvolume plugin.
Test Plan: Move the volume sliders in the Android app
Reviewers: kdeconnect, #kde_connect, albertvaka
Reviewed By: #kde_connect, albertvaka
Subscribers: albertvaka, kdeconnect
Tags: #kde_connect, #windows
Maniphest Tasks: T10000
Differential Revision: https://phabricator.kde.org/D16936
