Bug 160560

I use the bookmarks toolbar for my most-frequently-used bookmarks, and as stuff
gets occasionally added to it, it grows to the point that bookmarks on the
right-hand side don't appear without using the drop-down tool.

After some time, of course, I go clean things up so that everything should fit
on the toolbar without needing the drop-down tool using the Manage Bookmarks
window. But even once those are fixed, whichever bookmarks were pushed off still
are not re-drawn on the toolbar until the window is resized, even by one pixel.

Reproduce by:
1. Add sufficient bookmarks with sufficiently long names that not all of them
can appear at once on the toolbar, but instead are pushed into a drop-down on
the right side.
2. Using 'Manage Bookmarks', rename some of these with smaller names so that
everything should fit on the toolbar.
3. Note that even though the bookmarks that were originally shown on the toolbar
are still there albeit with shorter names, those that were in the drop-down will
not get drawn on the toolbar itself until the windoww is slightly resized.

I'm seeing this under i386 but am fairly confident that this is not an
architecture-specific bug.

I have not been able to access the Mozilla Bugzilla to file a similar bug there
but a query there didn't appear to locate the same problem.