Fixed few Qt deprecation warnings related to QColor and QFontMetric

GUI/coregui/Views/IntensityDataWidgets/ColorMapUtils.cpp

@@ -51,7 +51,11 @@ QCPRange qcpRange(double xmin, double xmax, int nbins) {
 QMargins defaultMargins(const QWidget& widget)
 {
     QFontMetrics fontMetric(widget.font());
+#if QT_VERSION >= QT_VERSION_CHECK(5, 11, 0)
+    auto em = fontMetric.horizontalAdvance('M'), fontAscent = fontMetric.ascent();
+#else
     auto em = fontMetric.width('M'), fontAscent = fontMetric.ascent();
+#endif
     int left = static_cast<int>(6.0 * em);
     int top = static_cast<int>(fontAscent * 1.5);
     int right = static_cast<int>(em * 1.2);

GUI/coregui/Views/MaterialEditor/MaterialItemUtils.cpp

@@ -169,11 +169,18 @@ ExternalProperty MaterialItemUtils::selectColorProperty(const ExternalProperty&
 {
     ExternalProperty result;
 
+#if QT_VERSION >= QT_VERSION_CHECK(5, 12, 0)
+    auto oldColor = previous.color();
+    auto newColor = QColorDialog::getColor(oldColor);
+    if (oldColor != newColor)
+        result = MaterialItemUtils::colorProperty(newColor);
+#else
     bool ok = false;
     QRgb oldRgba = previous.color().rgba();
     QRgb newRgba = QColorDialog::getRgba(oldRgba, &ok, nullptr);
     if (ok && newRgba != oldRgba)
         result = MaterialItemUtils::colorProperty(QColor::fromRgba(newRgba));
+#endif
 
     return result;
 }

GUI/coregui/Views/SampleDesigner/SampleToolBar.cpp

@@ -80,9 +80,16 @@ SampleToolBar::SampleToolBar(SampleViewActions* sampleActions,
     QStringList scales = QStringList() << "25%" << "50%" << "75%" << "100%" << "125%" << "150%";
     m_scaleCombo->addItems(scales);
     m_scaleCombo->setCurrentIndex(3);
+#if QT_VERSION >= QT_VERSION_CHECK(5, 13, 0)
+    connect(m_scaleCombo,
+            static_cast<void(QComboBox::*)(const QString &)>(&QComboBox::currentTextChanged),
+            this, &SampleToolBar::onScaleComboChanged);
+#else
     connect(m_scaleCombo,
             static_cast<void(QComboBox::*)(const QString &)>(&QComboBox::currentIndexChanged),
             this, &SampleToolBar::onScaleComboChanged);
+#endif
+
     addWidget(m_scaleCombo);
 
     // MaterialEditor

GUI/coregui/mainwindow/projectmanager.cpp

@@ -395,7 +395,11 @@ QString ProjectManager::untitledProjectName()
     if (projectDir.exists()) {
         for (size_t i = 1; i < 99; ++i) {
             result = QString("Untitled") + QString::number(i);
+#if QT_VERSION >= QT_VERSION_CHECK(5, 13, 0)
+            projectDir.setPath(workingDirectory() + "/" + result);
+#else
             projectDir = workingDirectory() + "/" + result;
+#endif
             if (!projectDir.exists())
                 break;
         }