SpectrumVis: propagate apply settings to GUI message quque if it exists

sdrbase/dsp/spectrumvis.cpp

@@ -915,6 +915,12 @@ void SpectrumVis::applySettings(const SpectrumSettings& settings, bool force)
 
     m_settings = settings;
     m_settings.m_fftSize = fftSize;
+
+    if (m_guiMessageQueue)
+    {
+        MsgConfigureSpectrumVis *msg = MsgConfigureSpectrumVis::create(m_settings, false);
+        m_guiMessageQueue->push(msg);
+    }
 }
 
 void SpectrumVis::handleConfigureDSP(uint64_t centerFrequency, int sampleRate)

sdrgui/gui/glspectrum.cpp

@@ -78,7 +78,7 @@ void GLSpectrum::setMeasurementParams(SpectrumSettings::Measurement measurement,
     // Resize splitter so there's just enough space for the measurements table
     // But don't use more than 50%
     QList<int> sizes = m_splitter->sizes();
-    if ((sizes[0] == 0) && (sizes[1] == 0))
+    if (parentWidget() && (sizes[0] == 0) && (sizes[1] == 0))
     {
         // Initial sizing when first created
         QSize s = parentWidget()->size();

sdrgui/gui/glspectrumgui.cpp

@@ -330,10 +330,6 @@ void GLSpectrumGUI::applySettings()
         return;
     }
 
-    if (m_glSpectrum) {
-        applySpectrumSettings();
-    }
-
     if (m_spectrumVis)
     {
         SpectrumVis::MsgConfigureSpectrumVis *msg = SpectrumVis::MsgConfigureSpectrumVis::create(m_settings, false);