handleAsyncUpdate never called for ValueSource

[ed95]

Do you provide a plug-in editor, and is the editor open? It sounds related to this issue:

Messages are only being handled while the editor is open

When using JUCE 6.0.8 to create a VST3 plugin on Linux, none of JUCE’s asynchronous messaging utilities relying on the global MessageManager work while the editor is closed. This means that among other things AsyncUpdaters, Timers, and calls to juce::MessageManager::callAsync() won’t do anything until the user opens the plugin’s editor. This seems to be consistent across Bitwig Studio, REAPER, Ardour, Renoise and Carla (which uses JUCE’s own plugin hosting). A minimal example of this (courtesy o…