New behavior on Artful: calling mir_create_menu_window_spec() with
parent == nullptr

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https://bugs.launchpad.net/bugs/1701563

Title:
  On Artful Kate crashes when run on Mir

Status in qtubuntu package in Ubuntu:
  New

Bug description:
  $ sudo apt install miral-examples kate
  $ miral-app
  [in the app terminal] $ gdb kate

  Expect: kate runs
  Actual:

  Thread 1 "kate" received signal SIGABRT, Aborted.
  __GI_raise (sig=sig@entry=6) at ../sysdeps/unix/sysv/linux/raise.c:58
  58    ../sysdeps/unix/sysv/linux/raise.c: No such file or directory.
  (gdb) bt
  #0  0x00007ffff25da77f in __GI_raise (sig=sig@entry=6)
      at ../sysdeps/unix/sysv/linux/raise.c:58
  #1  0x00007ffff25dc37a in __GI_abort () at abort.c:89
  #2  0x00007fffe1463b78 in mir::require(bool) ()
      at ./src/include/common/mir/require.h:28
  #3  0x00007fffe1463b78 in mir_create_menu_window_spec (connection=
      0x555555959f40, width=640, height=480, parent=0x0, rect=0x7fffffffcb90, 
edge=mir_edge_attachment_any) at ./src/client/mir_surface_api.cpp:79
  #4  0x00007fffe1716f31 in  ()
      at 
/usr/lib/x86_64-linux-gnu/qt5/plugins/platforms/libqpa-ubuntumirclient.so
  #5  0x00007fffe17180eb in  ()
      at 
/usr/lib/x86_64-linux-gnu/qt5/plugins/platforms/libqpa-ubuntumirclient.so
  #6  0x00007fffe170506b in  ()
      at 
/usr/lib/x86_64-linux-gnu/qt5/plugins/platforms/libqpa-ubuntumirclient.so
  #7  0x00007ffff3f200c9 in QWindowPrivate::create(bool) ()
      at /usr/lib/x86_64-linux-gnu/libQt5Gui.so.5
  #8  0x00007ffff46e5585 in QWidgetPrivate::create_sys(unsigned long long, 
bool, bool) () at /usr/lib/x86_64-linux-gnu/libQt5Widgets.so.5
  #9  0x00007ffff46e4d7d in QWidget::create(unsigned long long, bool, bool) ()
      at /usr/lib/x86_64-linux-gnu/libQt5Widgets.so.5
  #10 0x00007ffff46e51e9 in QWidget::winId() const ()
      at /usr/lib/x86_64-linux-gnu/libQt5Widgets.so.5

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