Fixed waterfall bug

core/src/gui/widgets/waterfall.cpp

@@ -359,7 +359,7 @@ namespace ImGui {
         }
 
         // Finally, if nothing else was selected, just move the VFO
-        if (ImGui::IsMouseDown(ImGuiMouseButton_Left)) {
+        if (ImGui::IsMouseDown(ImGuiMouseButton_Left) && (mouseInFFT|mouseInWaterfall)) {
             if (selVfo != NULL) {
                 int refCenter = mousePos.x - (widgetPos.x + 50);
                 if (refCenter >= 0 && refCenter < dataWidth) {