Now I don't get any error but the clipboard is still not working.

What does that mean "not working"?

What happens when you run the test t/zz-GtkTextBuffer.t (does it pass, is the clipboard section skipped)?

gtk-text-buffer-set-text shows text/length just like gtk-clipboard-set-text but zz-GtkTextBuffer.t shows set_text without a length argument, so

What happens if you use  set_text($col1content);?

In reply to Re^2: Gtk3::Clipboard problem by Anonymous Monk
in thread Gtk3::Clipboard problem [SOLVED] by brilant_blue

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