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fix sticky warning....
fix sticky warning. Widget.warning('text....') was infinitely sticky in some cases like content manager raising 'not implemented' on copy. The make default click_callback to dismiss notification, and fix the logic to not unbind the click handler if it requests the notification not to be dismissed.

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r20294:06a51f16
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clearoutput.py
20 lines | 627 B | text/x-python | PythonLexer
"""Module containing a preprocessor that removes the outputs from code cells"""
# Copyright (c) IPython Development Team.
# Distributed under the terms of the Modified BSD License.
from .base import Preprocessor
class ClearOutputPreprocessor(Preprocessor):
"""
Removes the output from all code cells in a notebook.
"""
def preprocess_cell(self, cell, resources, cell_index):
"""
Apply a transformation on each cell. See base.py for details.
"""
if cell.cell_type == 'code':
cell.outputs = []
cell.execution_count = None
return cell, resources