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Fix initialization problem with useblit on SpanSelector instance creatio... #1971

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Fix initialization problem with useblit on SpanSelector instance creatio... #1971

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4 changes: 3 additions & 1 deletion lib/matplotlib/widgets.py
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Expand Up @@ -1066,6 +1066,7 @@ def __init__(self, ax, onselect, direction, minspan=None, useblit=False,
self.rectprops = rectprops
self.onselect = onselect
self.onmove_callback = onmove_callback
self.useblit = useblit
self.minspan = minspan

# Needed when dragging out of axes
Expand All @@ -1075,14 +1076,15 @@ def __init__(self, ax, onselect, direction, minspan=None, useblit=False,
# Reset canvas so that `new_axes` connects events.
self.canvas = None
self.new_axes(ax)
self.useblit = useblit and self.canvas.supports_blit

def new_axes(self, ax):
self.ax = ax
if self.canvas is not ax.figure.canvas:
self.disconnect_events()

self.canvas = ax.figure.canvas
# check to see if new canvas supports blitting and, if not, disable
self.useblit = self.useblit and self.canvas.supports_blit
self.connect_event('motion_notify_event', self.onmove)
self.connect_event('button_press_event', self.press)
self.connect_event('button_release_event', self.release)
Expand Down