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move NavigationToolbar2 canvas assignment to __new__ #5121

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move NavigationToolbar2 canvas assignment to __new__ #5121

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8 changes: 6 additions & 2 deletions lib/matplotlib/backend_bases.py
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Original file line number Diff line number Diff line change
Expand Up @@ -2720,9 +2720,13 @@ class NavigationToolbar2(object):
('Save', 'Save the figure', 'filesave', 'save_figure'),
)

def __new__(cls, canvas):
instance = super(NavigationToolbar2, cls).__new__(cls, canvas)
instance.canvas = canvas
canvas.toolbar = instance
return instance

def __init__(self, canvas):
self.canvas = canvas
canvas.toolbar = self
# a dict from axes index to a list of view limits
self._views = cbook.Stack()
self._positions = cbook.Stack() # stack of subplot positions
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