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e3ace39
(Get the code!)
I too have been seeing this issue on my Ubuntu 16.04.6 LTS installation and after living with it for a long long time, decided to hunt down reports of others with the issue. As I now see, it is a known issue. That sort of made me feel better - specifically that misery loves company - :(.
Here is how I can reliably reproduce this issue on my system:
Configure at least 2 workspaces:
On the left workspace, open an application - say Chrome
On the right workspace I have Firefox
If I switch between workspaces using keyboard shortcuts, the right-click context menu on Firefox continues to function as expected. Also, if I click the Workspace Switcher in launcher and select the different workspaces, again Firefox context menu functions as expected.
However, if I click the Chrome icon in the launcher and then click the Firefox icon (in essence I'm switching workspaces indirectly), the Firefox context menu appears at random locations - mainly along the edges of the screen - I am yet to see it appear in a random location away from screen edges (see attached screenshot).
I have noticed there are several ways to restore the placement of the context menu:
* Middle-click the title bar (or the panel if Firefox is maximized)
* Switch to another application running in the same workspace and return to Firefox
* Move the Firefox window
* Resize the Firefox window
There could be other ways to restore the context menu, but the few I mention above work reliably in my environment.
I'm hoping that when I migrate to Ubuntu 20.04 next year the issue will have been resolved.