Description of problem:

On a NoteBook where the tab bar is set to scroll and not shrink the tabs to fit,
adding a new tab when that tab will not fit, results in the new tab to be
truncated (see the first attached screenshot). Selecting the tab to it's left
then going back to this right most tab yields the correct result (see second
attached screenshot) of having an arrow to the very left showing that there's
more tabs that can't be displayed.

I've witnessed this problem in "gedit", "galeon", "liferea" (a non-gnome app,
pure GTK2) and a custom piece of pygtk code I put together to experiment with
this.

Version-Release number of selected component (if applicable):

gtk2-2.8.18-1

How reproducible:

100%

Steps to Reproduce:
1. fire up "gedit"
2. click "New" repeatedly until you run out of space for tabs
3.

Actual results:

tab truncated

Expected results:

tab not-truncated

Additional info: