Sort out the hide controls state persistence in fast and wide graphs

QWidget::isVisible()  and QWidget::isHidden()  unsurprisingly are  not
directly complementary, in this case QWidget::isHidden() is the needed
functionality.

Thanks to Mike W9MDB for the initial version of this change.

git-svn-id: svn+ssh://svn.code.sf.net/p/wsjt/wsjt/branches/wsjtx@7702 ab8295b8-cf94-4d9e-aec4-7959e3be5d79

fastgraph.cpp

@@ -1,8 +1,11 @@
 #include "fastgraph.h"
+
 #include "commons.h"
 #include <QSettings>
 #include <QApplication>
 #include "fastplot.h"
+#include "SettingsGroup.hpp"
+
 #include "ui_fastgraph.h"
 #include "moc_fastgraph.cpp"
 
@@ -21,8 +24,8 @@ FastGraph::FastGraph(QSettings * settings, QWidget *parent) :
   installEventFilter(parent);                   //Installing the filter
   ui->fastPlot->setCursor(Qt::CrossCursor);
 
-//Restore user's settings
-  m_settings->beginGroup("FastGraph");
+  //Restore user's settings
+  SettingsGroup g {m_settings, "FastGraph"};
   restoreGeometry (m_settings->value ("geometry", saveGeometry ()).toByteArray ());
   ui->fastPlot->setPlotZero(m_settings->value("PlotZero", 0).toInt());
   ui->fastPlot->setPlotGain(m_settings->value("PlotGain", 0).toInt());
@@ -31,33 +34,30 @@ FastGraph::FastGraph(QSettings * settings, QWidget *parent) :
   ui->fastPlot->setGreenZero(m_settings->value("GreenZero", 0).toInt());
   ui->greenZeroSlider->setValue(ui->fastPlot->m_greenZero);
   ui->controls_widget->setVisible (!m_settings->value("HideControls", false).toBool ());
-  m_settings->endGroup();
 
   connect (ui->fastPlot, &FPlotter::fastPick, this, &FastGraph::fastPick);
 }
 
-FastGraph::~FastGraph()
-{
-  saveSettings();
-}
-
 void FastGraph::closeEvent (QCloseEvent * e)
 {
   saveSettings ();
   QDialog::closeEvent (e);
 }
 
+FastGraph::~FastGraph ()
+{
+}
+
 void FastGraph::saveSettings()
 {
 //Save user's settings
-  m_settings->beginGroup("FastGraph");
+  SettingsGroup g {m_settings, "FastGraph"};
   m_settings->setValue ("geometry", saveGeometry ());
   m_settings->setValue("PlotZero",ui->fastPlot->m_plotZero);
   m_settings->setValue("PlotGain",ui->fastPlot->m_plotGain);
   m_settings->setValue("GreenZero",ui->fastPlot->m_greenZero);
   m_settings->setValue("GreenGain",ui->fastPlot->m_greenGain);
-  m_settings->setValue("HideControls",!ui->controls_widget->isVisible ());
-  m_settings->endGroup();
+  m_settings->setValue ("HideControls", ui->controls_widget->isHidden ());
 }
 
 void FastGraph::plotSpec(bool diskData, int UTCdisk)

fastgraph.h

@@ -14,13 +14,9 @@ class FastGraph : public QDialog
 {
   Q_OBJECT
 
-protected:
-  void closeEvent (QCloseEvent *) override;
-  void keyPressEvent( QKeyEvent *e ) override;
-
 public:
   explicit FastGraph(QSettings *, QWidget *parent = 0);
-  ~FastGraph();
+  ~FastGraph ();
 
   void   plotSpec(bool diskData, int UTCdisk);
   void   saveSettings();
@@ -36,6 +32,10 @@ private slots:
   void on_greenZeroSlider_valueChanged(int value);
   void on_pbAutoLevel_clicked();
 
+protected:
+  void closeEvent (QCloseEvent *) override;
+  void keyPressEvent( QKeyEvent *e ) override;
+
 private:
   QSettings * m_settings;
   float m_ave;

widegraph.cpp

@@ -1,4 +1,5 @@
 #include "widegraph.h"
+
 #include <algorithm>
 #include <QApplication>
 #include <QSettings>
@@ -6,8 +7,8 @@
 #include "commons.h"
 #include "Configuration.hpp"
 #include "MessageBox.hpp"
-#include "moc_widegraph.cpp"
 #include "SettingsGroup.hpp"
+#include "moc_widegraph.cpp"
 
 namespace
 {
@@ -140,7 +141,7 @@ void WideGraph::saveSettings()                                           //saveS
   m_settings->setValue ("UserPalette", QVariant::fromValue (m_userPalette.colours ()));
   m_settings->setValue("Flatten",m_bFlatten);
   m_settings->setValue("UseRef",m_bRef);
-  m_settings->setValue("HideControls",!ui->controls_widget->isVisible());
+  m_settings->setValue ("HideControls", ui->controls_widget->isHidden ());
 }
 
 void WideGraph::drawRed(int ia, int ib)