debugTracedSegments top-level property
The segments every traceRoom call has taken in (step 3 of spec 10 D5, after the short ones are dropped), summed: the tracer's cost for tests that pin it (D7's counter). Never reset by the library.
For tests only. It carries no @visibleForTesting: that annotation
lives in package:meta or Flutter, and this file imports neither (as
RoomInputs.debugRebuilds).
Implementation
int debugTracedSegments = 0;