Bug 21139: Floating toolbar - Resize toolbar on window resize

Bug 21139: Floating toolbar - Resize toolbar on window resize

Prior to this patch the toolbar was not resized when the window was
resized

Signed-off-by: Owen Leonard <oleonard@myacpl.org>
Signed-off-by: Katrin Fischer <katrin.fischer.83@web.de>
Signed-off-by: Nick Clemens <nick@bywatersolutions.com>
(cherry picked from commit 5ecf4da7d49357832b77ee087d968e071ab46b93)
Signed-off-by: Martin Renvoize <martin.renvoize@ptfs-europe.com>
(cherry picked from commit 5eecc789af216e56638525961a8c25dd9677c9db)
Signed-off-by: Fridolin Somers <fridolin.somers@biblibre.com>