re-implemented alpha assoc/deassoc when color managing

app/widget/scope/scopebase/scopebase.cpp

@@ -102,7 +102,7 @@ void ScopeBase::OnPaint()
 
   if (buffer_) {
     // Convert reference frame to display space
-    renderer()->BlitColorManaged(color_service(), texture_, managed_tex_.get());
+    renderer()->BlitColorManaged(color_service(), texture_, true, managed_tex_.get());
 
     DrawScope(managed_tex_, pipeline_);
   }

app/widget/viewer/viewerdisplay.cpp

@@ -298,7 +298,7 @@ void ViewerDisplayWidget::OnPaint()
     }
 
     // Draw texture through color transform
-    renderer()->BlitColorManaged(color_service(), texture_,
+    renderer()->BlitColorManaged(color_service(), texture_, true,
                                  VideoParams(width(), height(), PixelFormat::PIX_FMT_RGBA16F),
                                  GetCompleteMatrixFlippedYTranslation());
   }