<p><a class="user-mention" data-hovercard-type="user" data-hovercard-url="/hovercards?user_id=811085" data-octo-click="hovercard-link-click" data-octo-dimensions="link_type:self" href="https://github.com/elextr">@elextr</a>  <a class="user-mention" data-hovercard-type="user" data-hovercard-url="/hovercards?user_id=181177" data-octo-click="hovercard-link-click" data-octo-dimensions="link_type:self" href="https://github.com/codebrainz">@codebrainz</a></p>
<p>This code applies rotation accordingly and works for Geany-own tabs as well tabs inserted by plugins.</p>
<pre><code>  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);
  }
</code></pre>
<p>You can do what you want with that piece, public domain.</p>

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