Once magnolia table connectors don't force relayout (MGNLUI-1234), we can see that tables no longer update their size when resizing the window (actually parent layouts are not updated either, they only react through pure CSS).

Silly diagnostic:

• When replacing appFrameView's tabsheet directly with the subapp view (e.g. a horizontal layout), then resizing is propagated nicely. So it seems tabsheet doesn't properly resize its tabs when it's resized itself.