Indicator Applet Appmenu has two 'Calculator' application menus

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Indicator Applet Appmenu has two 'Calculator' application menus (Preferences, Help, About, Quit). This applies to GNOME Calculator 3.20.1. It should only have one 'Calculator' application menu.

According to Sebastien Bacher (see comment #3), this is a general integration issue with some GNOME apps. So I will also note here that sometimes the second menu has the name of a different application, or 'Unknown Application Name' and is unusable (i.e. clicking on its menu items does nothing). Sometimes only the unusable menu is displayed so one can't use the application menu at all.

When Indicator Applet Appmenu isn't being used, for some apps, there is no application menu at all in the Ubuntu (GNOME) Flashback session.

Going through my applications, at least one of the above issues appear in:
Disks (3.20.2)
Font Viewer (3.20.2)
Help (yelp) (3.20.1)
Screenshot (3.18.0)
AisleRiot Solitaire (3.20.2)
Sudoku (3.18.2)
Calendar (3.20.2)
Cheese (3.20.2)
Disk Usage Analyser (Baobab) (3.18.1)
Ubuntu Software (3.20.1)
System Log (3.9.90)
System Monitor (3.20.1)
Terminal (3.18.3)

I also get the issue with a menu having the name of a different application and being unusable, or being an application menu for the focused window but being titled 'Unknown Application Name', with LibreOffice 5.1.2.2 which is not a GNOME app.

ProblemType: Bug
DistroRelease: Ubuntu 16.10
Package: indicator-applet-appmenu 12.10.2+15.04.20141127.2-0ubuntu1
ProcVersionSignature: Ubuntu 4.4.0-23.41-generic 4.4.10
Uname: Linux 4.4.0-23-generic x86_64
ApportVersion: 2.20.1-0ubuntu4
Architecture: amd64
CurrentDesktop: GNOME-Flashback:Unity
Date: Mon May 23 11:34:28 2016
InstallationDate: Installed on 2016-04-26 (26 days ago)
InstallationMedia: Ubuntu 16.10 "Yakkety Yak" - Alpha amd64 (20160426)
SourcePackage: indicator-applet
UpgradeStatus: No upgrade log present (probably fresh install)

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The menu items come up in a slightly different order if the Appmenu is added to the panel whilst GNOME Calculator is open (if it wasn't in the panel before).

[Sebastien Bacher (seb128)]

Thank you for your bug report, that's a known integration issue with some GNOME applications. Those have 2 menus, one exported to the desktop interface and a local one, under unity those are merged into a menubar rather than displayed in different place ... the one exported and one of the local ones have the same name in that case which is a bit unfortunate

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Right, well since it's a general bug I've detailed other issues in the bug report. They may be separate bugs; if it would be helpful to split them out then I'll do that. I'm not sure which issues are unrelated to this one though. As I've put in the description, one of them affects LibreOffice, which is not a GNOME app.

[Sebastien Bacher (seb128)]

unsure what's the libreoffice issue you are talking about, that's for sure a different bug that the one in the title of this bug report