Reinstate warning as a pending warning

Author: ksunden

lib/matplotlib/axes/_axes.py

@@ -3876,9 +3876,10 @@ def boxplot(self, x, notch=None, sym=None, vert=None,
 
         vert : bool, optional
             .. deprecated:: 3.11
-                Use of *vert* is discouraged in 3.10 with formal deprecation set
-                for 3.11. Use *orientation* instead.
+                Use *orientation* instead.
 
+                This is a pending deprecation for 3.10, with full deprecation
+                in 3.11 and removal in 3.13.
                 If this is given during the deprecation period, it overrides
                 the *orientation* parameter.
 
@@ -4224,9 +4225,10 @@ def bxp(self, bxpstats, positions=None, widths=None, vert=None,
 
         vert : bool, optional
             .. deprecated:: 3.11
-                Use of *vert* is discouraged in 3.10 with formal deprecation
-                set for 3.11. Use *orientation* instead.
+                Use *orientation* instead.
 
+                This is a pending deprecation for 3.10, with full deprecation
+                in 3.11 and removal in 3.13.
                 If this is given during the deprecation period, it overrides
                 the *orientation* parameter.
 
@@ -4361,6 +4363,13 @@ def merge_kw_rc(subkey, explicit, zdelta=0, usemarker=True):
         # if set to False.
         if vert is None:
             vert = mpl.rcParams['boxplot.vertical']
+        else:
+            _api.warn_deprecated(
+                "3.11",
+                name="vert: bool",
+                alternative="orientation: {'vertical', 'horizontal'}",
+                pending=True,
+            )
         if vert is False:
             orientation = 'horizontal'
         _api.check_in_list(['horizontal', 'vertical'], orientation=orientation)
@@ -8637,6 +8646,12 @@ def violin(self, vpstats, positions=None, vert=None,
         # deprecation period expires. If both are selected,
         # vert takes precedence.
         if vert is not None:
+            _api.warn_deprecated(
+                "3.11",
+                name="vert: bool",
+                alternative="orientation: {'vertical', 'horizontal'}",
+                pending=True,
+            )
             orientation = 'vertical' if vert else 'horizontal'
         _api.check_in_list(['horizontal', 'vertical'], orientation=orientation)
 

lib/matplotlib/tests/test_axes.py

@@ -9315,7 +9315,10 @@ def test_violinplot_orientation(fig_test, fig_ref):
     # Compare images between a figure that
     # uses vert and one that uses orientation.
     ax_ref = fig_ref.subplots()
-    ax_ref.violinplot(all_data, vert=False)
+
+    with pytest.warns(PendingDeprecationWarning,
+                      match='vert: bool'):
+        ax_ref.violinplot(all_data, vert=False)
 
     ax_test = fig_test.subplots()
     ax_test.violinplot(all_data, orientation='horizontal')