FIX: remove warning when clearing axes with shared axis (matplotlib#32069)

Co-authored-by: Saumya Agrawal <145997182+saumyacoder1709@users.noreply.github.com>

Author: dkludwig

lib/matplotlib/axes/_base.py

@@ -1354,8 +1354,13 @@ def __clear(self):
         xaxis_visible = self.xaxis.get_visible()
         yaxis_visible = self.yaxis.get_visible()
 
-        for axis in self._axis_map.values():
+        for name, axis in self._axis_map.items():
             axis.clear()  # Also resets the scale to linear.
+            # need to do any shared axis scales as well
+            for other in axis._get_shared_axes():
+                if other is self.axes:
+                    continue
+                other._axis_map[name]._set_scale("linear")
         for spine in self.spines.values():
             spine._clear()  # Use _clear to not clear Axis again
 

lib/matplotlib/tests/test_axes.py

@@ -37,6 +37,7 @@
 from matplotlib.projections.geo import HammerAxes
 from matplotlib.projections.polar import PolarAxes
 import matplotlib.pyplot as plt
+import matplotlib.scale as mscales
 import matplotlib.text as mtext
 import matplotlib.ticker as mticker
 import matplotlib.transforms as mtransforms
@@ -9308,6 +9309,24 @@ def test_shared_axes_clear(fig_test, fig_ref):
         ax.plot(x, y)
 
 
+def test_shared_axes_clear_scale(recwarn):
+    _, axs = plt.subplots(1, 2, sharey=True)
+    x = range(1, 10)
+    axs[0].loglog(x, x)
+    axs[1].loglog(x, x)
+    axs[0].clear()
+
+    assert len(recwarn) == 0
+
+    # the cleared axes has linear on both axis
+    for axis in axs[0]._axis_map.values():
+        assert isinstance(axis._scale, mscales.LinearScale)
+
+    # the linked axes becomes linear on the shared y-axis
+    assert isinstance(axs[1].xaxis._scale, mscales.LogScale)
+    assert isinstance(axs[1].yaxis._scale, mscales.LinearScale)
+
+
 def test_shared_axes_retick():
     fig, axs = plt.subplots(2, 2, sharex='all', sharey='all')