
--------------------
URGENCY: to do soon
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URGENCY: high
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URGENCY: medium
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- If you plan to refactor code and make it compatible only for
  wx.Python4.1.1/wxPython4.2.0, erase `TestListCtrl` class on
  youtubedl_ui.py. Also check all code that starts with wx.version().
  Note this operation leads to make Vidtuber code incompatible
  for wxPython4.0.7.

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URGENCY: low
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