Device GUIs: Constain window size via minimumSize/maximumSize, rather than handling resizeEvent. Add maximum button. Hide size buttons when window size is fixed

plugins/samplesource/sdrplay/sdrplaygui.cpp

@@ -18,7 +18,6 @@
 #include <QDebug>
 #include <QMessageBox>
 #include <QFileDialog>
-#include <QResizeEvent>
 
 #include "sdrplaygui.h"
 
@@ -44,7 +43,7 @@ SDRPlayGui::SDRPlayGui(DeviceUISet *deviceUISet, QWidget* parent) :
     m_sampleSource = (SDRPlayInput*) m_deviceUISet->m_deviceAPI->getSampleSource();
 
     ui->setupUi(getContents());
-    setSizePolicy(QSizePolicy::Fixed, QSizePolicy::Fixed);
+    sizeToContents();
     getContents()->setStyleSheet("#SDRPlayGui { background-color: rgb(64, 64, 64); }");
     m_helpURL = "plugins/samplesource/sdrplay/readme.md";
     ui->centerFrequency->setColorMapper(ColorMapper(ColorMapper::GrayGold));
@@ -128,12 +127,6 @@ bool SDRPlayGui::deserialize(const QByteArray& data)
     }
 }
 
-void SDRPlayGui::resizeEvent(QResizeEvent* size)
-{
-    adjustSize();
-    size->accept();
-}
-
 bool SDRPlayGui::handleMessage(const Message& message)
 {
     if (SDRPlayInput::MsgConfigureSDRPlay::match(message))