Public bug reported:

Problem appears in indicator menus in Ubuntu 14.04, and it is NOT present in 
Ubuntu 12.04.
The bug can be seen even in official indicators like the network manager.

We have: "Indicator menu / Submenu / Submenu item". (e.g. Network
manager / VPN Connections / Configure VPN...).

The submenu item does not trigger "activate" and "button-press-events",
if the user changes between right and left while clicking on the way to
the submenu item and if they also don't explicitly click the submenu.

For example these combinations WORK: 
* Click indicator with any button/ Explicitly click with any button to open 
submenu / Click submenu item with any button
* Left-click indicator / Just hover to open submenu (do not click) / Left-click 
submenu item
* Right-click indicator/Just hover to open submenu (do not click) / Right-click 
submenu item

Any other combination DOESN'T work, for example:

* Left-click indicator / Just hover to open submenu / Right-click submenu item
* Right-click indicator / Just hover to open submenu / Left-click submenu item

These GNOME bugs might be relevant:
https://bugzilla.gnome.org/show_bug.cgi?id=533492
https://bugzilla.gnome.org/show_bug.cgi?id=695488

But this might be not be a bug in GTK, but in the way the indicator menu
is presented. I had a very similar problem with right-click popup menus
in my own application Variety and I managed to fix them in my own code.
Here is the bugreport, with solution described:
https://bugs.launchpad.net/variety/+bug/1044909

Citing the solution from this bugreport: "This was solved by calling
menu.popup(None, None, _compute_position, None, 0, event.time) instead
of menu.popup(None, None, _compute_position, None, event.button,
event.time) - for some reason if event.button was passed as the menu
trigger, then the same button that triggered the menu (right mouse
button in our case) was also the only button that successfully triggered
the submenu items"

** Affects: indicator-appmenu (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: click submenu

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https://bugs.launchpad.net/bugs/1348147

Title:
  Submenu items not triggering activate events under specific conditions

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