Hope helps fixing this bug Ubuntu level with I doed work:
I follow down upstream GTK+ 3.6 version awailable commits and searched what 
commit fix this issue in GTK+ 3.5.6 version. I generated a debdiff with Precise 
awailable gtk+3.0 source package and added proper upstream patch.
We have lucky, because the upstream level 3.5.6 version committed fix 
compatible with GTK+3.4.2 version.

I risk little, but doed a local build the patched package with my local
testing Ubuntu 12.04.1 system, and tested the modified version after
installation and restart. Because in Orca screen reader preferences
dialog I always experienced this issue prewious when I tryed the wrote
testcase, I repeat the testcase the modified installed package. I opened
Orca preferences dialog, press tab key, and press two shift+tab key
combination. Prewious original GTK 3.4.2 version the focus not land
right with OK button, the focus land with speak objects under mouse
check box. Now focus right land with OK button, similar with Ubuntu
Quantal awailable upstream GTK 3.6.0 version. If I opened prewious
original GTK+3.4.2 version the Orca preferences dialog, press TAB key
and a shift+TAB key and try switch next page with right arrow key, the
page tab switch not happened right, focus land the speak objects under
mouse check button. The modified version page tab switch happening right
this testcase too.

Sebastien, your openion have chance to land this important fix with Ubuntu 
12.04? Ubuntu 12.04 release policy enable to backport this fix with GTK+ 3.4.2 
version?
Not only a11y products affecting this fix, normal keyboard navigation working 
broken with multipage dialogs in GTK+ 3.4.2 if an Ubuntu user using keyboard 
the navigation and known the description wrote testcase.
Unfortunately GNOME Developers not will be releasing new maintenance release 
the 3.4 series GNOME components, and this fix land upstream level after end of 
3.4 series officialy maintenance cicle.
If the LTS release policy not enable to accept this fix, I full agree this 
choice.

Attila

** Patch added: "A debdiff with containing upstream 3.5.6 version committed 
patch"
   
https://bugs.launchpad.net/ubuntu/+source/gtk+3.0/+bug/1061419/+attachment/3370763/+files/gtk-notebook.debdiff

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https://bugs.launchpad.net/bugs/1061419

Title:
  [Precise only] Some keyboard navigation breakage with GTK Notebook

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