Only override pickradius when picker is not a bool.

This was done when the deprecation was added, but then removed when it
was undeprecated. However, people now seem to be relying on this new
behaviour, and it seems more correct, so we should add it back.

Fixes matplotlib#19700.

Author: QuLogic

lib/matplotlib/lines.py

@@ -397,7 +397,8 @@ def __init__(self, xdata, ydata,
         self.update(kwargs)
         self.pickradius = pickradius
         self.ind_offset = 0
-        if isinstance(self._picker, Number):
+        if (isinstance(self._picker, Number) and
+                not isinstance(self._picker, bool)):
             self.pickradius = self._picker
 
         self._xorig = np.asarray([])

lib/matplotlib/tests/test_lines.py

@@ -4,6 +4,7 @@
 
 import itertools
 import timeit
+from types import SimpleNamespace
 
 from cycler import cycler
 import numpy as np
@@ -264,3 +265,29 @@ def test_marker_as_markerstyle():
 def test_odd_dashes(fig_test, fig_ref):
     fig_test.add_subplot().plot([1, 2], dashes=[1, 2, 3])
     fig_ref.add_subplot().plot([1, 2], dashes=[1, 2, 3, 1, 2, 3])
+
+
+def test_picking():
+    fig, ax = plt.subplots()
+    mouse_event = SimpleNamespace(x=fig.bbox.width // 2,
+                                  y=fig.bbox.height // 2 + 15)
+
+    # Default pickradius is 5, so event should not pick this line.
+    l0, = ax.plot([0, 1], [0, 1], picker=True)
+    found, indices = l0.contains(mouse_event)
+    assert not found
+
+    # But with a larger pickradius, this should be picked.
+    l1, = ax.plot([0, 1], [0, 1], picker=True, pickradius=20)
+    found, indices = l1.contains(mouse_event)
+    assert found
+    assert_array_equal(indices['ind'], [0])
+
+    # And if we modify the pickradius after creation, it should work as well.
+    l2, = ax.plot([0, 1], [0, 1], picker=True)
+    found, indices = l2.contains(mouse_event)
+    assert not found
+    l2.set_pickradius(20)
+    found, indices = l2.contains(mouse_event)
+    assert found
+    assert_array_equal(indices['ind'], [0])