By not very hard I meant something like this:

gint n = gtk_notebook_get_n_pages(nb);
for (gint i=0; i < n; n++)
{
  GtkWidget *wid = gtk_notebook_get_tab_label(nb,
    gtk_notebook_get_nth_page(i));
  if (GTK_IS_LABEL(wid))
  {
    gtk_label_set_ellipsize(GTK_LABEL(wid), PANGO_ELLIPSIZE_END);
    gtk_label_set_width_chars(GTK_LABEL(wid),
      interface_prefs.sidebar_tab_label_width);
  }
}

It should work fine with the normal (UTF-8) text that's in the tab labels, and has no impact on translations. It might need to switch PANGO_ELLIPSIZE_END to _START if the UI is in right-to-left mode, if GTK+ doesn't already handle this itself, but otherwise it should "just work".

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