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Code updating the task may also set fields as hints about how to display
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it: show_pct, show_spinner, show_eta, show_count, show_bar. UIs
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will not necessarily respect all these fields.
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def __init__(self, parent_task=None, ui_factory=None, progress_view=None):
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"""Construct a new progress task.
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Normally you should not call this directly but rather through
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`ui_factory.nested_progress_bar`.