[panel] F10 menu initially shown about half screen down

Bug Description

Steps to reproduce:
1. alt-tab to a Firefox window (only Firefox now due to bug #839628)
2. press F10

Expected result:
The menu is shown near the top panel.

Current result:
The menu is shown about half way down the screen.

Subsequent F10 presses while staying in Firefox window or navigating through the menu don't show that behavior.

It seems that it's only the case for Firefox and Thunderbird - but I have noticed a similar bug while working on bug https://bugs.launchpad.net/unity/+bug/839628 - the F10 menu open. The reason for this bug to appear was that the menu bar widget was not visible before the showMenu() call for the first menu entry. For the menu to appear correctly, the AppNameApplet needs to call the updateWidgets() function (with the isOpened parameter set) before showing the actual menu, otherwise it wrongly calculates the menu coordinates. In my F10 fix, I did it by issuing a new setOpened() call before showing the menu (not too pretty, but fast and works). Either the same thing needs to be done for the Firefox and Thunderbird menus, or I should find a better way of fixing it.

Oh, and the menu position during this bug is the same as in this test case:

1. Go to an empty virtual desktop
2. Click on an indicator to pop up the menu
3. Take your mouse of the menu
4. Navigate out of the indicators through the menus using left and right arrows

The menu for applications appears at the same place then.

This bug was fixed in the package unity-2d - 4.12.0-0ubuntu1

---------------
unity-2d (4.12.0-0ubuntu1) oneiric; urgency=low

* New upstream release
- unity-2d-panel assert failure: *** glibc detected *** unity-2d-panel:
malloc(): smallbin double linked list corrupted: 0x08313b28 ***
(LP: #845979)
- unity-2d-panel assert failure: *** glibc detected *** unity-2d-panel:
corrupted double-linked list: 0x094bc9b0 *** (LP: #852012)
- unity-2d-panel crashed with SIGSEGV (LP: #843432)
- Dragging downwards from the menu bar or double clicking on the menu bar
should un-maximise the window (LP: #661049)
- [dash] Dash is shown when pressing and releasing quickly super+KEY
(LP: #801073)
- [dash] Do search, scroll down using mouse, then maximise window. Layout
breaks (LP: #817421)
- F10 doesn't start keyboard navigation to the panel (LP: #839628)
- [dash] Gridview moves to top when you open or close the "Show X more.."
dropdown or the Filter pane (LP: #850036)
- Impossible to navigate between panel menus when the mouse cursor is over
the panel (LP: #834065)
- [panel] F10 menu initially shown about half screen down (LP: #853766)
- [dash] Filter pane doesn't clear its background when switching lenses
(LP: #858590)
- [shortcuts] <Super><Shift># should launch a new instance of #
application (LP: #768006)
- unity-2d-spread missing background images when path includes Unicode
(LP: #855508)
-- Didier Roche <email address hidden> 2011年9月29日 16:58:34 +0200