From 37285a9bce6dbc34ceb000cf0543ca94e9c98402 Mon Sep 17 00:00:00 2001
From: Jon Beniston <jon@beniston.com>
Date: Mon, 31 Jul 2023 21:43:15 +0100
Subject: [PATCH] Clear with alpha=1 to fix #1735

---
 sdrgui/gui/glspectrumview.cpp | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/sdrgui/gui/glspectrumview.cpp b/sdrgui/gui/glspectrumview.cpp
index c6cfb3e9e..04c2eafd2 100644
--- a/sdrgui/gui/glspectrumview.cpp
+++ b/sdrgui/gui/glspectrumview.cpp
@@ -975,7 +975,7 @@ void GLSpectrumView::paintGL()
     }
 
     QOpenGLFunctions *glFunctions = QOpenGLContext::currentContext()->functions();
-    glFunctions->glClearColor(0.0f, 0.0f, 0.0f, 0.0f);
+    glFunctions->glClearColor(0.0f, 0.0f, 0.0f, 1.0f);
     glFunctions->glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
 
     QMatrix4x4 spectrogramGridMatrix;