Public bug reported:

When I open a popup selection menu or a drop-down menu from a legacy
menu bar, it behaves oddly.
First, it appears in about the right place.  Then it jumps to the top-
left of the owning window, and the items scroll off.  I can navigate it
with the keyboard and mouse and it's almost usable.  When the popup is
closed and I try to open it again, it refuses to appear until I quit the
appliation and reopen it.

Example 1:

 * open Settings
 * select Default Applications
 * click one of the options to pop up its menu
 * it may open in the right place, or immediately jump to the top left of the 
window
 * if it opened in place, attempts to interact cause it to jump to the top left 
of the window
 * close the popup, and it can't be opened again (at least not visibly)
 * close the app, reopen it, and the process can be repeated

Example 2:

 * some apps with legacy embedded menu bars also behave weirdly, e.g.
Quod Libet's menus will jump around similarly quite often, but not
entirely consistently

I assumed gnome-shell is responsible for positioning and rendering
popups, but maybe this is a GTK+3 bug?

ProblemType: Bug
DistroRelease: Ubuntu 20.04
Package: gnome-shell 3.36.0-2ubuntu1
ProcVersionSignature: Ubuntu 5.4.0-18.22-generic 5.4.24
Uname: Linux 5.4.0-18-generic x86_64
NonfreeKernelModules: zfs zunicode zavl icp zcommon znvpair
ApportVersion: 2.20.11-0ubuntu21
Architecture: amd64
CurrentDesktop: GNOME
Date: Fri Mar 27 09:55:45 2020
DisplayManager: gdm3
InstallationDate: Installed on 2011-11-06 (3063 days ago)
InstallationMedia: Ubuntu 11.10 "Oneiric Ocelot" - Release amd64 (20111011)
RelatedPackageVersions: mutter-common 3.36.0-2ubuntu1
SourcePackage: gnome-shell
UpgradeStatus: Upgraded to focal on 2020-02-25 (30 days ago)

** Affects: gnome-shell (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: amd64 apport-bug focal third-party-packages wayland-session

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https://bugs.launchpad.net/bugs/1869261

Title:
  popups move to top left of window when opened

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