Have just found that Trim to Intersection is either broken in U15 or at least doesn't work as v81. See screenshot below and sample attached.
I started Trim to Intersection using PM 7,4, picked the angled part of Line 1 and then Line 2. What I want to see is the result as shown in V8i-Complete, but didn't in U15.
I'm assuming that this is a bug in U15.