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richardsheridan · richardsheridan · commit 9255fb6af095 · 2020-10-27T08:44:32.000-04:00
diff --git a/lib/matplotlib/backends/_backend_tk.py b/lib/matplotlib/backends/_backend_tk.py
@@ -1,3 +1,4 @@
+import uuid
 from contextlib import contextmanager
 import logging
 import math
@@ -46,7 +47,7 @@ def _restore_foreground_window_at_end():
 
 _blit_args = {}
 # Initialize to a non-empty string that is not a Tcl command
-_blit_tcl_name = "29345091836409813"
+_blit_tcl_name = "mpl_blit_" + uuid.uuid4().hex
 
 
 def _blit(argsid):
@@ -108,12 +109,10 @@ def blit(photoimage, aggimage, offsets, bbox=None):
     argsid = repr(id(args))
     _blit_args[argsid] = args
 
-    global _blit_tcl_name
     try:
         photoimage.tk.call(_blit_tcl_name, argsid)
     except tk.TclError:
         # register _blit with code copied from tkinter.Misc._register
-        _blit_tcl_name = repr(id(_blit)) + _blit.__name__
         photoimage.tk.createcommand(_blit_tcl_name, _blit)
         photoimage.tk.call(_blit_tcl_name, argsid)
 
diff --git a/lib/matplotlib/backends/backend_tkagg.py b/lib/matplotlib/backends/backend_tkagg.py
@@ -1,6 +1,7 @@
+from . import _backend_tk
 from .backend_agg import FigureCanvasAgg
 from ._backend_tk import (
-    _BackendTk, FigureCanvasTk, FigureManagerTk, NavigationToolbar2Tk, blit)
+    _BackendTk, FigureCanvasTk, FigureManagerTk, NavigationToolbar2Tk)
 
 
 class FigureCanvasTkAgg(FigureCanvasAgg, FigureCanvasTk):
@@ -9,7 +10,8 @@ def draw(self):
         self.blit()
 
     def blit(self, bbox=None):
-        blit(self._tkphoto, self.renderer._renderer, (0, 1, 2, 3), bbox=bbox)
+        _backend_tk.blit(
+            self._tkphoto, self.renderer._renderer, (0, 1, 2, 3), bbox=bbox)
 
 
 @_BackendTk.export
