Maximized window buttons do not extend to the corner of the screen

[The Fiddler]

Using the new invisible window buttons on Unity, I noticed an annoying issue: on a maximized window, the window buttons do not extend all the way to the edges. They have a 1 to 4 pixel gap that make targetting with the mouse or the touchpad quite annoying.

Ideally, I should be able to close a window by throwing the mouse to the top-left corner and clicking blindly. This is because the 'close' button is by far the most common:
- you close windows roughly an order of magnitude more often than you minimize or maximize them
- you can maximize/unmaximize a window by double clicking the titlebar, so the maximize button already has a big enough target.

The solution is two step:
1. make the hit-area for the three buttons extend all the way to the top edge of the screen.
2. make the hit-area for the close button extend all the way to the left edge of the screen.

I am willing to send a patch, if someone can point me to the right direction. Is this part of theming (which files) or of the unity plugin?

Thanks.

ProblemType: Bug
DistroRelease: Ubuntu 11.10
Package: unity 4.10.2-0ubuntu2
ProcVersionSignature: Ubuntu 3.0.0-9.14-generic 3.0.3
Uname: Linux 3.0.0-9-generic x86_64
NonfreeKernelModules: fglrx
Architecture: amd64
CompizPlugins: [core,bailer,detection,composite,opengl,compiztoolbox,decor,move,gnomecompat,imgpng,mousepoll,resize,vpswitch,regex,grid,snap,obs,commands,animation,place,session,expo,unitymtgrabhandles,wall,workarounds,ezoom,staticswitcher,fade,scale,unityshell,scaleaddon]
Date: Sun Aug 28 13:59:24 2011
SourcePackage: unity
UpgradeStatus: Upgraded to oneiric on 2011-08-26 (2 days ago)

[The Fiddler (stapostol)]

I should also mention that this behavior is inconsistent with the invisible menus and the indicators on the other side of the screen. Menus extend to the top edge, as do indicators. Additionally, the last indicator extends all the way to the right (i.e. you can throw the mouse blindly and hit the powercog button).

[André Oliva (gandreoliva)]

Just a comment: This bug wouldn't exist if the current Ubuntu button was not removed. This idea fixes both problems:

http://sites.google.com/site/gandreoliva/hybridbutton