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Mark these words with fire and iron: You do not call GUI functions from another thread. You only do that from the main thread(also called gui thread). You could do it from another thread but you need to acquire some specific GDK locks first, if I remember correctly. https://ubuntuforums.org/showthread.php?t=2103045

Further reading:

• See an example of multi-threading. Note the use of Glib::Dispatcher: https://developer.gnome.org/gtkmm-tutorial/stable/sec-multithread-example.html.en
• Using a Glib::Dispatcher: https://developer.gnome.org/gtkmm-tutorial/stable/sec-using-glib-dispatcher.html.en

Event handlers return value

• https://developer.gnome.org/gtkmm-tutorial/stable/sec-xeventsignals.html.en
• true if the event has been handled, and nothing is left to do. In this case the event is considered as dealt with.
• false if the event has not been handled, or there is still work to do. In this case, the event is transmitted to the parent.

Include order

• https://stackoverflow.com/questions/2762568/c-c-include-header-file-order
• https://stackoverflow.com/questions/11639809/should-i-repeat-inclusions-in-cpp-and-h

Having debug symbols by default

• https://cmake.org/pipermail/cmake/2008-September/023808.html

You can't just launch a thread and forget about it

The thread variable should not go out of scope while the thread is still running:

• Terminate called without an active exception
• https://stackoverflow.com/questions/13999432/stdthread-terminate-called-without-an-active-exception-dont-want-to-joi

A class to launch a thread

• https://stackoverflow.com/questions/2938571/how-to-declare-a-function-that-accepts-a-lambda