There are more affected apps then I supposed. They are:
"Disk usage analyzer" (baobab)
"GNOME Disks" (gnome-disk-utility)
"Calculator" (gnome-calculator)
"System monitor" (gnome-system-monitor)
"Help" (yelp)
"Sudoku" (gnome-sudoku)
"Cheese" (cheese)
** Also affects: baobab (Ubuntu)
Importance:
Same bug affects some other GNOME apps, too. I will list them today.
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https://bugs.launchpad.net/bugs/1574035
Title:
2 identical menus in the window header
To
** Changed in: gnome-software (Ubuntu)
Importance: Undecided => Low
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https://bugs.launchpad.net/bugs/1574035
Title:
2 identical menus in the window header