Avoid modifying user input to Axes.bar

QuLogic · QuLogic · commit a535924ab5b4 · 2024-03-14T02:36:03.000-04:00
The `error_kw` parameter is a dictionary, on which `setdefault` is
called, which would modify user input.
diff --git a/lib/matplotlib/axes/_axes.py b/lib/matplotlib/axes/_axes.py
@@ -2434,7 +2434,7 @@ def bar(self, x, height, width=0.8, bottom=None, *, align="center",
         # checking and processing will be left to the errorbar method.
         xerr = kwargs.pop('xerr', None)
         yerr = kwargs.pop('yerr', None)
-        error_kw = kwargs.pop('error_kw', {})
+        error_kw = kwargs.pop('error_kw', {}).copy()
         ezorder = error_kw.pop('zorder', None)
         if ezorder is None:
             ezorder = kwargs.get('zorder', None)
@@ -2590,9 +2590,8 @@ def bar(self, x, height, width=0.8, bottom=None, *, align="center",
 
             error_kw.setdefault("label", '_nolegend_')
 
-            errorbar = self.errorbar(ex, ey,
-                                     yerr=yerr, xerr=xerr,
-                                     fmt='none', **error_kw)
+            errorbar = self.errorbar(ex, ey, yerr=yerr, xerr=xerr, fmt='none',
+                                     **error_kw)
         else:
             errorbar = None
 
