one attempt are fixing the variables view

Now however the discrepancy has been reversed and the hiden variables
now has an extra space instead of being bigger than the others.
Merge branch 'mac-ui-fixes' into mac-compile-fix
Fixed 'show hidden variables' button underlap

Fixed it by adding a space to the distances between elements in the
left panel. I'm not sure where did all of the margins come from - it
could be Qt5 being more specific about its margins now.