From 40ac34dc956f27c79cb03b9304d3bbdc1fa36965 Mon Sep 17 00:00:00 2001
From: "Andrew D. Zonenberg" <azonenberg@drawersteak.com>
Date: Tue, 30 Jan 2024 21:21:53 -0800
Subject: [PATCH] Allow protocol overlays and spectrograms to be stacked
 regardless of which one is being dragged

---
 src/ngscopeclient/WaveformArea.cpp | 9 +++++++--
 1 file changed, 7 insertions(+), 2 deletions(-)

diff --git a/src/ngscopeclient/WaveformArea.cpp b/src/ngscopeclient/WaveformArea.cpp
index 5dbe0ada4..f38912aec 100644
--- a/src/ngscopeclient/WaveformArea.cpp
+++ b/src/ngscopeclient/WaveformArea.cpp
@@ -3654,9 +3654,14 @@ bool WaveformArea::IsCompatible(StreamDescriptor desc)
 
 	switch(desc.GetType())
 	{
-		//All density plots must be in their own views and cannot stack
-		case Stream::STREAM_TYPE_EYE:
+		//Allow stacking protocol overlays on spectrograms
 		case Stream::STREAM_TYPE_SPECTROGRAM:
+			if( (GetFirstAnalogStream() == nullptr) && (GetFirstDensityFunctionStream() == nullptr) )
+				return true;
+			break;
+
+		//All other density plots must be in their own views and cannot stack
+		case Stream::STREAM_TYPE_EYE:
 		case Stream::STREAM_TYPE_WATERFALL:
 			return false;