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fix unhiding of legendwidget

don't swallow QT::Show event but propagate to parent class. if one does not propagate the event the legend won't get un-hidden after hiding it.

steps to reproduce buggy behaviour:

  1. tear off legend widget (not sure this is the right vocabulary) (see screenshot 1)
  2. move focus to some other app and move back. legend window get's shown but no content (see screenshot 2)

with the simple change in this MR the legend gets shown properly.

image image

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