Merge pull request matplotlib#13990 from meeseeksmachine/auto-backport-of-pr-13989-on-v3.1.x

Backport PR matplotlib#13989 on branch v3.1.x (FIX: update not replace hist_kwargs when density is passed)

Author: timhoffm

lib/matplotlib/axes/_axes.py

@@ -6732,7 +6732,7 @@ def hist(self, x, bins=None, range=None, density=None, weights=None,
 
         density = bool(density) or bool(normed)
         if density and not stacked:
-            hist_kwargs = dict(density=density)
+            hist_kwargs['density'] = density
 
         # List to store all the top coordinates of the histograms
         tops = []

lib/matplotlib/tests/test_axes.py

@@ -6367,3 +6367,10 @@ def test_hist_nan_data():
 
     assert np.allclose(bins, nanbins)
     assert np.allclose(edges, nanedges)
+
+
+def test_hist_range_and_density():
+    _, bins, _ = plt.hist(np.random.rand(10), "auto",
+                          range=(0, 1), density=True)
+    assert bins[0] == 0
+    assert bins[-1] == 1