house keeping for matplotlib#2629

Added NavigationToolbar2QTAgg back with a deprecation warning

Added entry to api_changes.rst

Author: tacaswell

doc/api/api_changes.rst

@@ -116,6 +116,9 @@ original location:
 * The ``fmt`` argument of :meth:`~matplotlib.axes.Axes.plot_date` has been
   changed from ``bo`` to just ``o``, so color cycling can happen by default.
 
+* Removed the class `FigureManagerQTAgg` and deprecated `NavigationToolbar2QTAgg`
+  which will be removed in 1.5.
+
 .. _changes_in_1_3:
 
 

lib/matplotlib/backends/backend_qt4agg.py

@@ -9,6 +9,7 @@
 import os  # not used
 import sys
 import ctypes
+import warnings
 
 import matplotlib
 from matplotlib.figure import Figure
@@ -24,6 +25,7 @@
 from .backend_qt4 import draw_if_interactive
 from .backend_qt4 import backend_version
 ######
+from matplotlib.cbook import mplDeprecation
 
 DEBUG = False
 
@@ -168,5 +170,15 @@ def print_figure(self, *args, **kwargs):
         self.draw()
 
 
+class NavigationToolbar2QTAgg(NavigationToolbar2QT):
+    def __init__(*args, **kwargs):
+        warnings.warn('This class has been depreciated in 1.4 ' +
+                      'as it has no additional functionality over ' +
+                      '`NavigationToolbar2QT`.  Please change your code to '
+                      'use `NavigationToolbar2QT` instead',
+                    mplDeprecation)
+        NavigationToolbar2QT.__init__(*args, **kwargs)
+
+
 FigureCanvas = FigureCanvasQTAgg
 FigureManager = FigureManagerQT