Merge pull request matplotlib#22594 from tacaswell/fix_errobar_dash

FIX: do not pass dashes to collections in errorbar

Author: oscargus

lib/matplotlib/axes/_axes.py

@@ -3411,7 +3411,8 @@ def _upcast_err(err):
         for key in ['marker', 'markersize', 'markerfacecolor',
                     'markeredgewidth', 'markeredgecolor', 'markevery',
                     'linestyle', 'fillstyle', 'drawstyle', 'dash_capstyle',
-                    'dash_joinstyle', 'solid_capstyle', 'solid_joinstyle']:
+                    'dash_joinstyle', 'solid_capstyle', 'solid_joinstyle',
+                    'dashes']:
             base_style.pop(key, None)
 
         # Make the style dict for the line collections (the bars).

lib/matplotlib/tests/test_axes.py

@@ -679,6 +679,20 @@ def test_plot_format_kwarg_redundant():
     plt.errorbar([0], [0], fmt='none', color='blue')
 
 
+@check_figures_equal(extensions=["png"])
+def test_errorbar_dashes(fig_test, fig_ref):
+    x = [1, 2, 3, 4]
+    y = np.sin(x)
+
+    ax_ref = fig_ref.gca()
+    ax_test = fig_test.gca()
+
+    line, *_ = ax_ref.errorbar(x, y, xerr=np.abs(y), yerr=np.abs(y))
+    line.set_dashes([2, 2])
+
+    ax_test.errorbar(x, y, xerr=np.abs(y), yerr=np.abs(y), dashes=[2, 2])
+
+
 @image_comparison(['single_point', 'single_point'])
 def test_single_point():
     # Issue #1796: don't let lines.marker affect the grid