editor rulers: do not try to generate "fill" ticks/lines for the grid

We now generate a grid from the TempoMap of appropriate "density". Doing this
in the editor just gets things wrong (and partially duplicates the (complex)
logic already present in the TempoMap).

gtk2_ardour/editor_rulers.cc

@@ -1438,51 +1438,9 @@ Editor::metric_get_bbt (std::vector<ArdourCanvas::Ruler::Mark>& marks, int64_t l
 				marks.push_back (mark);
 				n++;
 			}
-
-			/* Add the tick marks */
-			skip = Temporal::ticks_per_beat / bbt_beat_subdivision;
-			tick = skip; // the first non-beat tick
-
-			t = 0;
-			while (tick < Temporal::ticks_per_beat && (n < bbt_nmarks)) {
-
-				BBT_Time bbt ((*i).bbt());
-
-				next_beat.beats = bbt.beats;
-				next_beat.bars = bbt.bars;
-				next_beat.ticks = tick;
-				pos = TempoMap::use()->sample_at (next_beat);
-
-				if (t % bbt_accent_modulo == (bbt_accent_modulo - 1)) {
-					i_am_accented = true;
-				}
-
-				/* We do not label these ticks marks, because
-				 * we cannot be sure of their function. They
-				 * could be sub-divisions of the time signature
-				 * denominator, or they could actually be the
-				 * time signature denominator points ("beats"
-				 * in BBT).
-				 */
-
-				mark.label = "";
-				mark.position = pos;
-
-				if ((bbt_beat_subdivision > 4) && i_am_accented) {
-					mark.style = ArdourCanvas::Ruler::Mark::Minor;
-				} else {
-					mark.style = ArdourCanvas::Ruler::Mark::Micro;
-				}
-				i_am_accented = false;
-				marks.push_back (mark);
-
-				tick += skip;
-				++t;
-				++n;
-			}
 		}
 
-	  break;
+		break;
 	}
 }