Disable global menu when focus policy is not "click" (or provide config option)

[jimav]

The Unity "Global Menu", mimics Mac OS by placing menus for the currently-focused app in a bar at the top of the screen, rather than attached to the app's own window.

This is a fine and Good Thing when using the default "click to focus" focus policy.

However Global Menu integration should be turned off when using "focus follows mouse" policy.

The problem is that with "focus follows mouse", when you move the mouse up to the menu bar, if the mouse briefly transits a window from another app, then that other app's menus appear in the global bar, rather than the menus of the app the user is working on. The current behavior is really quite annoying and inconvenient: To access an app's menus, you end up having to first move the app window up right against the top bar, then carefully move the mouse into the bar and slide it over to the desired menu without deviating into the desktop area where another app's window, e.g. a terminal, often exists)

Many, if not most, power users/developers do not use click-to-focus, but prefer focus-follows-mouse. If global menu integration could be turned on and off at will, then everybody will be happy.

Note: Focus Policy can be changed using the Unity Tweek Tool (Window Manager->Additional).
A new "Use Global Menu Integration" option probably should be added.

ProblemType: Bug
DistroRelease: Ubuntu 13.10
Package: unity 7.1.2+13.10.20131014.1-0ubuntu1
ProcVersionSignature: Ubuntu 3.11.0-14.21-generic 3.11.7
Uname: Linux 3.11.0-14-generic x86_64
ApportVersion: 2.12.5-0ubuntu2.2
Architecture: amd64
CompizPlugins: No value set for `/apps/compiz-1/general/screen0/options/active_plugins'
Date: Wed Jan 15 12:21:24 2014
InstallationDate: Installed on 2013-08-06 (162 days ago)
InstallationMedia: Ubuntu 13.04 "Raring Ringtail" - Release amd64 (20130424)
MarkForUpload: True
SourcePackage: unity
UpgradeStatus: Upgraded to saucy on 2013-10-24 (83 days ago)