[Qt] Unity ignores application's attempt to disable menu item.

[Nathan Osman]

Binary package hint: unity

No clue if this is the right place to file this bug, but it does seem to be limited to Unity.

I have an application that creates a menu. There is a menu item in the menu that frequently gets enabled / disabled. When the application enables the menu item, everything works fine. However, disabling the menu item isn't working. This seems to be limited to Unity since it works in the Classic session.

Here is a simple Qt source file that demonstrates the problem: http://pastebin.com/DF9CHps5

To compile this brief demo:

1. Make sure that the Qt development files are installed.
2. Create a new folder and stick the code in 'main.cpp'
3. Create another file in that folder named 'demo.pro' and put this in it: http://pastebin.com/Z7GRFW8t
4. Open a terminal in that directory and run 'qmake demo.pro ; make'
5. You can then run the demo with './demo'

The expected behavior is that the menu item's state matches that of the checkbox. However, this does not seem to be the case on Unity - although the menu item enables itself when the checkbox is checked, it fails to disable itself when the checkbox is unchecked.

Details:

Ubuntu 11.04 64-bit
Qt 4.7.2

[Bilal Akhtar (bilalakhtar)]

I managed to reproduce this one successfully. The appmenu in Unity doesn't update itself when a menuitem is disabled.

[Launchpad Janitor (janitor)]

Status changed to 'Confirmed' because the bug affects multiple users.

[Filipe Roque (flip-roque)]

I have upgraded to 12.04 and the bug still exists.

[Lars Tandle Kyllingstad (kyllingstad)]

A workaround for this bug is to add and remove a dummy menu item after disabling the item. This seems to force an update.

The bug also occurs when enabling/disabling entire menus in the menu bar, but the above workaround doesn't seem to work in that case.

[enz (markus-enzenberger)]

For me, this works now in Ubuntu 12.04 (packages updated as of today, proprietary ATI driver). I definitely had seen this bug in 11.10. i don't remember if it worked in 12.04 from the beginning or after some packages were updated.

[enz (markus-enzenberger)]

Forgot to say: I tested your example in both Unity and Unity 2D and it works on both for me.

[Albert Astals Cid (aacid)]

I'm with enz, works here on 12.04 as of today

[Alberto Salvia Novella (es20490446e)]

Are you still experiencing this bug in any current supported Ubuntu release? (https://wiki.ubuntu.com/Releases)

If so please execute the following command in a terminal, as it will automatically gather debugging information:
apport-collect 787946

[Nathan Osman (george-edison55)]

I just ran the demo again in Raring and it seems to have gone away. I guess this was fixed recently.