From 59ee039abe9d4adee072cbe5b4bd909bc9f2415a Mon Sep 17 00:00:00 2001
From: tiy <tiy@umich.edu>
Date: Mon, 12 Dec 2022 16:29:07 -0500
Subject: [PATCH] Boxplot: Median line is now bound within the box for all
 linewidths

---
 lib/matplotlib/axes/_axes.py      | 3 +++
 lib/matplotlib/tests/test_axes.py | 9 +++++++++
 2 files changed, 12 insertions(+)

diff --git a/lib/matplotlib/axes/_axes.py b/lib/matplotlib/axes/_axes.py
index ecb6f5e2098b..5390d0578e8f 100644
--- a/lib/matplotlib/axes/_axes.py
+++ b/lib/matplotlib/axes/_axes.py
@@ -4119,6 +4119,9 @@ def bxp(self, bxpstats, positions=None, widths=None, vert=True,
 
         zdelta = 0.1
 
+        if medianprops is None or medianprops.get('solid_capstyle', None) is None:
+            medianprops['solid_capstyle'] = 'butt'
+
         def merge_kw_rc(subkey, explicit, zdelta=0, usemarker=True):
             d = {k.split('.')[-1]: v for k, v in mpl.rcParams.items()
                  if k.startswith(f'boxplot.{subkey}props')}
diff --git a/lib/matplotlib/tests/test_axes.py b/lib/matplotlib/tests/test_axes.py
index 5b39be8bccdf..67aa0dba9248 100644
--- a/lib/matplotlib/tests/test_axes.py
+++ b/lib/matplotlib/tests/test_axes.py
@@ -3367,6 +3367,15 @@ def test_boxplot_zorder():
     assert ax.boxplot(x, zorder=10)['boxes'][0].get_zorder() == 10
 
 
+@check_figures_equal()
+def test_boxplot_median_bound_by_box(fig_test, fig_ref):
+    data = np.arange(3)
+    medianprops_test = {"linewidth": 12}
+    medianprops_ref = {**medianprops_test, "solid_capstyle": "butt"}
+    fig_test.subplots().boxplot(data,  medianprops=medianprops_test)
+    fig_ref.subplots().boxplot(data, medianprops=medianprops_ref)
+
+
 def test_boxplot_marker_behavior():
     plt.rcParams['lines.marker'] = 's'
     plt.rcParams['boxplot.flierprops.marker'] = 'o'