Using this:

Gtk3::Gdk::keyval_name($event->keyval)

instead of this:

Gtk3::Gdk->keyval_name($event->keyval)

...was the first thing I tried, and for some inexplicable reason, it produces the same error message.

I had also checked the Gtk2 > Gtk3 migration documents. The change to Keysyms seems to be a red herring; the test code translates a value like 65478 into a keycode like f10, which bypasses the corresponding key symbol GDK_F10 entirely.

In reply to Re^2: Use Gtk3::Gdk to intercept keypresses by Anonymous Monk
in thread Use Gtk3::Gdk to intercept keypresses by Anonymous Monk

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