From 01f89856170f907cd8f1e2e33054a994846b995b Mon Sep 17 00:00:00 2001
From: Robin Gareus <robin@gareus.org>
Date: Fri, 24 Apr 2015 23:22:15 +0200
Subject: don’t knob show tooltips if no prefix is set
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ie the monitor section has explicit labels.
---
 gtk2_ardour/ardour_knob.cc | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

(limited to 'gtk2_ardour/ardour_knob.cc')

diff --git a/gtk2_ardour/ardour_knob.cc b/gtk2_ardour/ardour_knob.cc
index 3f5271c9d3..a960b8ec5d 100644
--- a/gtk2_ardour/ardour_knob.cc
+++ b/gtk2_ardour/ardour_knob.cc
@@ -382,7 +382,9 @@ ArdourKnob::controllable_changed ()
 	_val = c->get_interface();  //% of knob travel
 	_val = min( max(0.0f, _val), 1.0f);  //range check
 
-	ARDOUR_UI::instance()->set_tip (*this, _tooltip_prefix + c->get_user_string());
+	if (!_tooltip_prefix.empty()) {
+		ARDOUR_UI::instance()->set_tip (*this, _tooltip_prefix + c->get_user_string());
+	}
 	set_dirty();
 }
 
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