API make passing num required from promote_figure

Author: tacaswell

mpl_gui/_promotion.py

@@ -37,10 +37,9 @@ def _auto_draw_if_interactive(fig, val):
             fig.canvas.draw_idle()
 
 
-def promote_figure(fig, *, auto_draw=True, num=None):
+def promote_figure(fig, *, auto_draw=True, num):
     """Create a new figure manager instance."""
     _backend_mod = current_backend_module()
-
     if (
         getattr(_backend_mod.FigureCanvas, "required_interactive_framework", None)
         and threading.current_thread() is not threading.main_thread()
@@ -74,7 +73,6 @@ def promote_figure(fig, *, auto_draw=True, num=None):
     # HACK: the callback in backend_bases uses GCF.destroy which misses these
     # figures by design!
     def _destroy(event):
-
         if event.key in mpl.rcParams["keymap.quit"]:
             # grab the manager off the event
             mgr = event.canvas.manager