Make most arguments to Figure/figure keyword only

Author: oscargus

lib/matplotlib/figure.py

@@ -2359,18 +2359,17 @@ def __repr__(self):
             naxes=len(self.axes),
         )
 
-    @_api.make_keyword_only("3.6", "facecolor")
     def __init__(self,
                  figsize=None,
                  dpi=None,
+                 *,
                  facecolor=None,
                  edgecolor=None,
                  linewidth=0.0,
                  frameon=None,
                  subplotpars=None,  # rc figure.subplot.*
                  tight_layout=None,  # rc figure.autolayout
                  constrained_layout=None,  # rc figure.constrained_layout.use
-                 *,
                  layout=None,
                  **kwargs
                  ):

lib/matplotlib/pyplot.py

@@ -687,10 +687,10 @@ def xkcd(scale=1, length=100, randomness=2):
 
 ## Figures ##
 
-@_api.make_keyword_only("3.6", "facecolor")
 def figure(num=None,  # autoincrement if None, else integer from 1-N
            figsize=None,  # defaults to rc figure.figsize
            dpi=None,  # defaults to rc figure.dpi
+           *,
            facecolor=None,  # defaults to rc figure.facecolor
            edgecolor=None,  # defaults to rc figure.edgecolor
            frameon=True,