On 03/03/2019 16:10, Paul Davis wrote:

John should really know that there's code to do this (to the best extent possible) within the Ardour source code at libs/gtkmm2ext/visibility_tracker.cc :)))

Hi Paul - that's in fact what I'm investigating....

There's a new object called 'PluginDspLoadWindow' which is getting displayed by Ardour but not by Mixbus for some reason. What's failing is those visibility_tracker calls to 'Gtk::Widget::is_mapped()' (and that's why I was asking what the call does...)

Anyway, this is off-topic now for the gtk-devel list. If I make any progress with it, I'll either file a bug report or maybe join you on IRC sometime. Best regards,

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