getText slide: register uid and level after slide hits
This feature refers to the getText attribute 'slide', which may be used for leveltitle, leveluid, levelmedia by default or to any field of pages by levelfield, if configured properly. Quite useful thing; not to be mixed up with the property 'slide' for CONTENT cObjects, which I'm not referring to hereby.
I think it would be even more useful, if one could refer to the menu's (pagetree's) level and a page's uid where the levelfield was fetched from after a slide hit during the walk back to the rootline.
The attached patch suggests two new register values
UID_FROM_LAST_PAGESLIDE_FOR_FIELD_[name of slided field]
LEVEL_FROM_LAST_PAGESLIDE_FOR_FIELD_[name of slided field]
which will be filled after each successful slide (i.e. there has been a slide hit) with the page uid and the menu level of the page that had some value for the requested field if it that was achieved by a slide to rootline.
(issue imported from #M8626)