Get rid of deprecated background()

src/assets/view/widgets/colorwheel.cpp

@@ -249,7 +249,7 @@ void ColorWheel::mouseReleaseEvent(QMouseEvent *event)
 void ColorWheel::resizeEvent(QResizeEvent *event)
 {
     m_image = QImage(event->size(), QImage::Format_ARGB32_Premultiplied);
-    m_image.fill(palette().background().color().rgb());
+    m_image.fill(palette().window().color().rgb());
 
     drawWheel();
     drawSlider();

src/assets/view/widgets/curves/abstractcurvewidget.ipp

@@ -54,7 +54,7 @@ template <typename Curve_t> void AbstractCurveWidget<Curve_t>::paintBackground(Q
     /*
      * Background
      */
-    p->fillRect(rect().translated(-offsetX, -offsetY), palette().background());
+    p->fillRect(rect().translated(-offsetX, -offsetY), palette().window());
     if (!m_pixmap.isNull()) {
         if (m_pixmapIsDirty || !m_pixmapCache) {
             m_pixmapCache = std::make_shared<QPixmap>(m_wWidth + 1, m_wHeight + 1);

src/assets/view/widgets/curves/curveparamwidget.ipp

@@ -301,7 +301,7 @@ template <typename CurveWidget_t> void CurveParamWidget<CurveWidget_t>::slotShow
             m_edit->setPixmap(QPixmap());
         } else {
             auto color = modeToColorsRGB(m_mode);
-            m_edit->setPixmap(QPixmap::fromImage(ColorTools::rgbCurvePlane(m_edit->size(), color, 1, palette().background().color().rgb())));
+            m_edit->setPixmap(QPixmap::fromImage(ColorTools::rgbCurvePlane(m_edit->size(), color, 1, palette().window().color().rgb())));
         }
     } else {
         m_edit->setPixmap(QPixmap());