matplotlib
diff --git a/‎lib/matplotlib/backends/backend_pdf.py
Lines changed: 6 additions & 3 deletions b/‎lib/matplotlib/backends/backend_pdf.py
Lines changed: 6 additions & 3 deletions
diff --git a/‎lib/matplotlib/backends/backend_svg.py
Lines changed: 2 additions & 2 deletions b/‎lib/matplotlib/backends/backend_svg.py
Lines changed: 2 additions & 2 deletions
@@ -1294,11 +1294,11 @@ def hatchPattern(self, hatch_style, forced_alpha):
             edge, face, hatch = hatch_style
             if edge is not None:
                 edge = tuple(edge)
-                if forced_alpha: # reset alpha if forced
+                if forced_alpha:  # reset alpha if forced
                     edge = edge[:3] + (1.0,)
             if face is not None:
                 face = tuple(face)
-                if forced_alpha: # reset alpha if forced
+                if forced_alpha:  # reset alpha if forced
                     face = face[:3] + (1.0,)
             hatch_style = (edge, face, hatch)
 
@@ -2321,12 +2321,14 @@ def clip_cmd(self, cliprect, clippath):
         (('_cliprect', '_clippath'), clip_cmd),
         (('_alpha', '_forced_alpha', '_effective_alphas'), alpha_cmd),
         (('_capstyle',), capstyle_cmd),
+        # If you change the next line also fix the check in delta
         (('_fillcolor',), fillcolor_cmd),
         (('_joinstyle',), joinstyle_cmd),
         (('_linewidth',), linewidth_cmd),
         (('_dashes',), dash_cmd),
         (('_rgb',), rgb_cmd),
         # must come after fillcolor and rgb
+        # If you change the next line also fix the check in delta
         (('_hatch', '_hatch_color', '_forced_alpha'), hatch_cmd),
         )
 
@@ -2356,7 +2358,8 @@ def delta(self, other):
                     break
 
             # Need to update hatching if we also updated fillcolor
-            if params == ('_hatch', '_hatch_color') and fill_performed:
+            if (params == ('_hatch', '_hatch_color', '_forced_alpha')
+                    and fill_performed):
                 different = True
 
             if different:
 
@@ -353,12 +353,12 @@ def _get_hatch(self, gc, rgbFace):
         forced_alpha = gc.get_forced_alpha()
         if rgbFace is not None:
             rgbFace = tuple(rgbFace)
-            if forced_alpha: # reset alpha if forced
+            if forced_alpha:  # reset alpha if forced
                 rgbFace = rgbFace[:3] + (1.0,)
         edge = gc.get_hatch_color()
         if edge is not None:
             edge = tuple(edge)
-            if forced_alpha: # reset alpha if forced
+            if forced_alpha:  # reset alpha if forced
                 edge = edge[:3] + (1.0,)
         dictkey = (gc.get_hatch(), rgbFace, edge, gc.get_forced_alpha())
         oid = self._hatchd.get(dictkey)