As we all know - from time to time - it is a lot of work to prepare a part of a drawing for a hatch.
To get rid of one of the basic task (cutting lines along the desired hatch boundary) it would be nice to have an add-on - or what ever - what would cut ALL intersection in a drawing (or just on one layer, or just based on a selection etc.) with just a mouse click. Then it would be much faster and easier to do the selection for the hatch boundaries.
The user could decide to make it directly in his drawing or he like to duplicate the drawing to an extra layer where this function will be used ....
Clive mentioned on this:
Maybe a tool like this could be an additional ‘Snap’ selection option - select all snap intersections or select snap intersections within a boundary! then as you suggest ‘cut’ at the intersection points.