"Move by offset" behaves as "Move To Position" for hidden items
I have an interaction that simulates clicking "more" to expand a blurb of text to reveal the full text.
Below the expanding text (and, therefore, moved down and back up when it expands or collapses) is a toolbar much like the one at the bottom of this Justinmind's Community textarea. My toolbar has buttons that can reveal custom menus.
Because of the way that dynamic panels crop anything that would extend beyond their boundaries (despite selecting "Always on top"), these "menus" are located at the "root" level of the outline, and carefully positioned so that they *appear* to be part of the toolbar. Thus, it is the responsibility of the "More"/"Less" buttons to reposition the menus so that they follow the movement of the toolbar.
If a menu is visible when the text is expanded/collapsed, it moves down and back up again by the offset specified in the move.
If a menu is hidden when the text is expanded/collapsed, then it is relocated to the absolute coordinates specified by the offset. Thus, the menus end up, in my case, at 0,80 when the text is expanded, and 0,-80 (making them very hard to use!) when the text is collapsed.