Hi! I think I found a bug:
When the timelines are shifted not by the same unit as the headers (e.g. in a hotel application where the days are split at midday - when the guests checks in/out), the crosshair follows the mouse "lazily".
Expected behaviour: The crosshair should be shown on the correct header, according to the time hovered by the mouse.
I've modified the first scheduler in the rowheadercolumns file to reproduce the bug. Attached is an image, where the red cross is the mouse position.