Given two widgets which have been created with the source widget
connected via -alignTop to the target widget, this sets
the top offset of the source widget
so that its baseline lines up with the target widget's baseline.
Options
targetWidget
The widget you are aligning to.
sourceWidget
The widget that will be adjusted.
currentOffset
Any top offset the target widget already has which must
be taken into account. (This is optional; the default is 0.)