Plotting: Let new MPL automatically determine xlims

 * Avoid setting xlims since recent matplotlib already does it correctly
 * and we should let it apply its default styles where possible (pandas-dev#15495)

Author: nmartensen

pandas/plotting/_core.py

@@ -29,7 +29,8 @@
 from pandas.util._decorators import Appender
 
 from pandas.plotting._compat import (_mpl_ge_1_3_1,
-                                     _mpl_ge_1_5_0)
+                                     _mpl_ge_1_5_0,
+                                     _mpl_ge_2_0_0)
 from pandas.plotting._style import (mpl_stylesheet, plot_params,
                                     _get_standard_colors)
 from pandas.plotting._tools import (_subplots, _flatten, table,
@@ -942,9 +943,10 @@ def _make_plot(self):
                              **kwds)
             self._add_legend_handle(newlines[0], label, index=i)
 
-            lines = _get_all_lines(ax)
-            left, right = _get_xlim(lines)
-            ax.set_xlim(left, right)
+            if not _mpl_ge_2_0_0():
+                lines = _get_all_lines(ax)
+                left, right = _get_xlim(lines)
+                ax.set_xlim(left, right)
 
     @classmethod
     def _plot(cls, ax, x, y, style=None, column_num=None,