feat: a repaired hole keeps a fainter band, so a report is not a false accusation

src/plot_host.cpp

@@ -377,7 +377,9 @@ void RowSet::set_invalid_spans(ScopeModel& model, DisplayMode mode) {
     // `Hole::x_begin`/`x_end` are stream seconds; the plots' x is `stream_t + epoch`.
     const f64 epoch = model.display_epoch();
     for (const Hole& h : model.holes()) {
-      spans_.emplace_back(h.x_begin + epoch, h.x_end + epoch);
+      // `repaired()` and not a second list: the band keeps reporting a repaired hole, in the
+      // fainter tint, until its slots age out of the ring and `forget_holes_before()` drops it.
+      spans_.push_back(plot::InvalidSpan{h.x_begin + epoch, h.x_end + epoch, h.repaired()});
     }
   }
   for (int i = 0; i < rows_; ++i) {