TIL: Normally, GtkApplication will assume that arguments passed on the command line are files to be opened.
./demo /tmp/test
This application can not open files.
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app = gtk_application_new("de.devlug.sandbox.demo", G_APPLICATION_HANDLES_OPEN);
Danach das Signal "open" per g_signal_connect "verbinden".
Open file:///tmp/test
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