more progress on M17 support

core/src/gui/widgets/symbol_diagram.h

@@ -3,6 +3,7 @@
 #include <imgui.h>
 #include <imgui_internal.h>
 #include <dsp/stream.h>
+#include <vector>
 #include <mutex>
 
 namespace ImGui {
@@ -17,6 +18,8 @@ namespace ImGui {
 
         void releaseBuffer();
 
+        std::vector<float> lines;
+
     private:
         std::mutex bufferMtx;
         float* buffer;