fixed an issue with sep attribute mngt / per pixel

Signed-off-by: Kai Blaschke <kai.blaschke@kb-dev.net>

Author: yoyofr

src/libprojectM/MilkdropPreset/CustomWaveform.cpp

@@ -76,15 +76,17 @@ void CustomWaveform::Draw(const PerFrameContext& presetPerFrameContext)
 
     int const maxSampleCount{m_spectrum ? Audio::SpectrumSamples : Audio::WaveformSamples};
 
+    int sampleCount = std::min(maxSampleCount, static_cast<int>(*m_perFrameContext.samples));
+    sampleCount -= m_sep;
+
     // Initialize and execute per-frame code
     LoadPerFrameEvaluationVariables(presetPerFrameContext);
     m_perFrameContext.ExecutePerFrameCode();
 
     // Copy Q and T vars to per-point context
     InitPerPointEvaluationVariables();
 
-    int sampleCount = std::min(maxSampleCount, static_cast<int>(*m_perFrameContext.samples));
-    sampleCount -= m_sep;
+    sampleCount = std::min(maxSampleCount, static_cast<int>(*m_perFrameContext.samples));
 
     // If there aren't enough samples to draw a single line or dot, skip drawing the waveform.
     if ((m_useDots && sampleCount < 1) || sampleCount < 2)