Change default value for the number of columns when generating a legend from the qt_editor, avoiding problems for large number of plots where no defaults are given for this value

Acanthostega · Acanthostega · commit 8ba7611b7b8c · 2015-12-22T12:28:18.000+01:00
diff --git a/lib/matplotlib/backends/qt_editor/figureoptions.py b/lib/matplotlib/backends/qt_editor/figureoptions.py
@@ -158,7 +158,7 @@ def apply_callback(data):
 
         if generate_legend:
             draggable = None
-            ncol = None
+            ncol = 1
             if axes.legend_ is not None:
                 old_legend = axes.get_legend()
                 draggable = old_legend._draggable is not None
