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[Łukasz Zemczak <1451946@xxxxxxxxxxxxxxxxxx>]

Thanks for looking into that Marco! I think the problem might be indeed
something with indicator-appmenu. I checked appmenu-qt5 and everything
seems fine there: appmenu-qt5 fetches the related QMenu and exports it
through DBus. During the hide/show the menu stays the same, the window
stays the same, so appmenu-qt5 has no reason to re-export it again as
all the previous contents are valid - and appmenu-qt5 really doesn't do
much more. It only re-exports menus when the menu parent changes, or the
menu itself. Here it has no reason to do that as none of the important
bits (the winId or the QMenu) changed. But somehow, the once exported
menu is invalidated/lost somewhere.

Adding indicator-appmenu to the investigation.

** Also affects: indicator-appmenu (Ubuntu)
   Importance: Undecided
       Status: New

** Changed in: indicator-appmenu (Ubuntu)
     Assignee: (unassigned) => Łukasz Zemczak (sil2100)

** Changed in: indicator-appmenu (Ubuntu)
       Status: New => In Progress

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https://bugs.launchpad.net/bugs/1451946

Title:
  Menu disappears if a window is hidden and then shown again

Status in appmenu-qt5 package in Ubuntu:
  In Progress
Status in indicator-appmenu package in Ubuntu:
  In Progress

Bug description:
  If a Qt 5 application window becomes hidden (QWidget::hide()) and then
  shown again, it loses its global menu.

  I have attached a simple application to show the problem. It occurs on
  Ubuntu 14.04 LTS with stock Qt 5.2.1.

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