From 462d08acbb0d6f4c65b1b0606934f815adf79b02 Mon Sep 17 00:00:00 2001
From: nick_m <mainsbridge@gmail.com>
Date: Fri, 15 Apr 2016 01:13:14 +1000
Subject: [PATCH] Tempo ramps - don't allow cross-dragging the first meter.

---
 libs/ardour/tempo.cc | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/libs/ardour/tempo.cc b/libs/ardour/tempo.cc
index e6f43e412a..f0fd17728a 100644
--- a/libs/ardour/tempo.cc
+++ b/libs/ardour/tempo.cc
@@ -1998,6 +1998,11 @@ TempoMap::solve_map (Metrics& imaginary, TempoSection* section, const double& pu
 void
 TempoMap::solve_map (Metrics& imaginary, MeterSection* section, const framepos_t& frame)
 {
+	/* disallow moving first meter past any subsequent one, and any movable meter before the first one */
+	const MeterSection* other =  &meter_section_at_locked (frame);
+	if ((!section->movable() && other->movable()) || (!other->movable() && section->movable() && other->frame() >= frame)) {
+		return;
+	}
 	MeterSection* prev_m = 0;
 
 	if (!section->movable()) {