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Steps-to-reproduce: 1. rightclick some component in component inspector - a popup (*) appears 2. hower the mouse over "Set Layout" -> a popup (#) appears with a selection of available layouts 3. move the mouse so that the layout selection popup (#) disappears , but the whole popup (*) remains. 4. Hower again over "Set Layout" to pop the popup (#) up again. ! the contents of the popup , i.e. the list of available layouts , is doubled. A new set of layouts appears every time (#) pops up. (#) is reset when (*) is closed.
*** This issue has been marked as a duplicate of 40707 ***