Adjust parent axes limits when clearing floating axes.

Without this patch, calling clear() in a FloatingAxes will reset the
limits of the (invisible, parent, rectilinear) axes to (0, 1), (0, 1),
instead of the values computed by adjust_axes_lim.  For example, try
adding a call to ax1.clear() in demo_floating_axes immediately after
the call to setup_axes1.

Author: anntzer

lib/mpl_toolkits/axisartist/floating_axes.py

@@ -258,7 +258,6 @@ def __init__(self, *args, grid_helper, **kwargs):
         _api.check_isinstance(GridHelperCurveLinear, grid_helper=grid_helper)
         super().__init__(*args, grid_helper=grid_helper, **kwargs)
         self.set_aspect(1.)
-        self.adjust_axes_lim()
 
     def _gen_axes_patch(self):
         # docstring inherited
@@ -282,6 +281,7 @@ def clear(self):
         orig_patch.set_transform(self.transAxes)
         self.patch.set_clip_path(orig_patch)
         self.gridlines.set_clip_path(orig_patch)
+        self.adjust_axes_lim()
 
     def adjust_axes_lim(self):
         bbox = self.patch.get_path().get_extents(

lib/mpl_toolkits/axisartist/tests/test_floating_axes.py

@@ -82,6 +82,7 @@ def test_curvelinear4():
         tick_formatter1=angle_helper.FormatterDMS(),
         tick_formatter2=None)
     ax1 = fig.add_subplot(axes_class=FloatingAxes, grid_helper=grid_helper)
+    ax1.clear()  # Check that clear() also restores the correct limits on ax1.
 
     ax1.axis["left"].label.set_text("Test 1")
     ax1.axis["right"].label.set_text("Test 2")