When the Crop tool is started in standard mode and then enabling
Advanced settings the window width is not updated, which can result
in a cut off toolbar.
This is caused by the design of the image tools which are not embedded
by a layout to the image view and therefore not automatically
exchanging layout/resize events.
To solve this SlideContainer::eventFilter() now handles
LayoutRequest events of the content widgets.
Updating the geometry for these events makes some layout problems in
SaveBar visible which is also derived from SlideContainer.
The message and link labels need to be adjusted to be still shrinkable
and don't force the SaveBar getting too wide.