Comment 11 for bug 1842910

Maybe I meant 'desktop-icons' and not 'ubuntu-dock' in the above.

Anyway, here is a stack trace of the popup menu positioning in the Ubuntu case. It starts in the right place on the desktop and then gets immediately repositioned to the Terminal window's cursor:

Desktop Icons-Message: 15:49:25.500: vv: setDummyCursorGeometry 1217.5523681640625,737.8848876953125 0x0
setDummyCursorGeometry@resource:///org/gnome/shell/ui/layout.js:800:25
_openMenu@/usr/share/gnome-shell/extensions/desktop-icons@csoriano/desktopGrid.js:366:9
_onPressButton@/usr/share/gnome-shell/extensions/desktop-icons@csoriano/desktopGrid.js:501:13
DesktopGrid</<@/usr/share/gnome-shell/extensions/desktop-icons@csoriano/desktopGrid.js:125:68

GNOME Shell-Message: 15:49:25.507: vv: setDummyCursorGeometry 325,149 9x18
setDummyCursorGeometry@resource:///org/gnome/shell/ui/layout.js:800:25
_setDummyCursorGeometry@resource:///org/gnome/shell/ui/ibusCandidatePopup.js:275:9
setPanelService/<@resource:///org/gnome/shell/ui/ibusCandidatePopup.js:176:13