Applying changes in the getters can lead to binding loops, and is
currently inconsistently applied. Removing the applyPendingChanges calls
from remaining getters, and adding a forceLayout() function for cases
where the immediate-apply behavior is needed.

Task-number:  QTBUG-30555
Parts-of-patch-by: Albert Astals Cid
Change-Id: I64632601e02f2a53060296ab7739577a749d916f
Reviewed-by: Andrew den Exter <andrew.den.exter@qinetic.com.au>
Reviewed-by: Albert Astals Cid <albert.astals@canonical.com>