background-grid-size-save

src/board/UBBoardController.cpp

@@ -179,14 +179,19 @@ void UBBoardController::initBackgroundGridSize()
     qreal dpi = UBApplication::displayManager->logicalDpi(ScreenRole::Control);
 
     //qDebug() << "dpi: " << dpi;
+    int gridSize;
 
+    if(UBSettings::settings()->backgroundGridSize()==-1)
+    {
     qreal screenY = UBApplication::displayManager->screenSize(ScreenRole::Control).height();
     qreal documentY = mActiveScene->nominalSize().height();
     qreal resolutionRatio = documentY / screenY;
 
     //qDebug() << "resolution ratio: " << resolutionRatio;
 
-    int gridSize = (resolutionRatio * 10. * dpi) / UBGeometryUtils::inchSize;
+    gridSize = (resolutionRatio * 10. * dpi) / UBGeometryUtils::inchSize;
+    } else
+        gridSize = UBSettings::settings()->backgroundGridSize();
 
     UBSettings::settings()->crossSize = gridSize;
     UBSettings::settings()->defaultCrossSize = gridSize;

src/core/UBSettings.cpp

@@ -826,6 +826,16 @@ void UBSettings::setDarkBackground(bool isDarkBackground)
     emit colorContextChanged();
 }
 
+void UBSettings::setBackgroundGridSize(int value)
+{
+    crossSize = value;
+    setValue("Board/BackgroundGridSize", value);
+}
+
+int UBSettings::backgroundGridSize()
+{
+    return value("Board/BackgroundGridSize", -1).toInt();
+}
 
 void UBSettings::setPageBackground(UBPageBackground background)
 {

src/core/UBSettings.h

@@ -92,6 +92,8 @@ class UBSettings : public QObject
         void setDarkBackground(bool isDarkBackground);
         void setPageBackground(UBPageBackground background);
         void setSeyesRuledBackground(bool isSeyesRuledBackground);
+        void setBackgroundGridSize(int value);
+        int backgroundGridSize();
 
         // Stylus palette related
         bool isStylusPaletteVisible();

src/gui/UBBackgroundPalette.cpp

@@ -158,7 +158,8 @@ void UBBackgroundPalette::showEvent(QShowEvent* event)
 void UBBackgroundPalette::sliderValueChanged(int value)
 {
     UBApplication::boardController->activeScene()->setBackgroundGridSize(value);
-    UBSettings::settings()->crossSize = value; // since this function is called (indirectly, by refresh) when we switch scenes, the settings will always have the current scene's cross size.
+    UBSettings::settings()->setBackgroundGridSize(value);
+    //UBSettings::settings()->crossSize = value; // since this function is called (indirectly, by refresh) when we switch scenes, the settings will always have the current scene's cross size.
 }
 
 void UBBackgroundPalette::defaultBackgroundGridSize()