FIX: cancel pending autoscale on manually setting limits

tacaswell · tacaswell · commit 15748b2970bb · 2020-05-13T20:20:39.000-04:00
closes #17331
diff --git a/lib/matplotlib/axes/_base.py b/lib/matplotlib/axes/_base.py
@@ -3332,6 +3332,9 @@ def set_xlim(self, left=None, right=None, emit=True, auto=False,
         left, right = sorted([left, right], reverse=bool(reverse))
 
         self._viewLim.intervalx = (left, right)
+        # Mark viewlims as no longer stale without triggering an autoscale.
+        for ax in self._shared_x_axes.get_siblings(self):
+            ax._stale_viewlim_x = False
         if auto is not None:
             self._autoscaleXon = bool(auto)
 
@@ -3601,6 +3604,9 @@ def set_ylim(self, bottom=None, top=None, emit=True, auto=False,
         bottom, top = sorted([bottom, top], reverse=bool(reverse))
 
         self._viewLim.intervaly = (bottom, top)
+        # Mark viewlims as no longer stale without triggering an autoscale.
+        for ax in self._shared_y_axes.get_siblings(self):
+            ax._stale_viewlim_y = False
         if auto is not None:
             self._autoscaleYon = bool(auto)
 
diff --git a/lib/matplotlib/tests/test_axes.py b/lib/matplotlib/tests/test_axes.py
@@ -6213,6 +6213,16 @@ def test_ytickcolor_is_not_markercolor():
         assert tick.tick1line.get_markeredgecolor() != 'white'
 
 
+def test_unautoscale():
+    fig, ax = plt.subplots()
+    x = np.arange(100)
+    y = np.linspace(-.1, .1, 100)
+    ax.scatter(x, y)
+    ax.set_ylim((-.5, .5), auto=None)
+    fig.canvas.draw()
+    assert_array_equal(ax.get_ylim(), (-.5, .5))
+
+
 @check_figures_equal(extensions=["png"])
 def test_polar_interpolation_steps_variable_r(fig_test, fig_ref):
     l, = fig_test.add_subplot(projection="polar").plot([0, np.pi/2], [1, 2])
