@elextr @codebrainz

This code applies rotation accordingly and works for Geany-own tabs as well tabs inserted by plugins.

  GtkNotebook *sidebarNotebook = GTK_NOTEBOOK(ui_lookup_widget(geany->main_widgets->window, "notebook3"));
  for (GList *iterator = gtk_container_get_children(sidebarNotebook); iterator; iterator = iterator->next) {
      GtkLabel *sidebarLabel = gtk_notebook_get_tab_label(sidebarNotebook, iterator->data);
      gtk_label_set_angle(sidebarLabel, 90);
  }

You can do what you want with that piece, public domain.

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