Gui: Add startup log when missing SVG support (#27694)

src/Gui/StartupProcess.cpp

@@ -226,6 +226,7 @@ void StartupPostProcess::execute()
     setWindowTitle();
     setProcessMessages();
     setAutoSaving();
+    checkQtSvgImageFormatSupport();
     setToolBarIconSize();
     setWheelEventFilter();
     setLocale();
@@ -271,6 +272,14 @@ void StartupPostProcess::setAutoSaving()
     AutoSaver::instance()->setCompressed(hDocGrp->GetBool("AutoSaveCompressed", true));
 }
 
+void StartupPostProcess::checkQtSvgImageFormatSupport()
+{
+    auto const supportedFormats = QImageReader::supportedImageFormats();
+    if (!supportedFormats.contains("svg")) {
+        Base::Console().warning("Qt SVG image format not supported; missing Qt SVG plugin?\n");
+    }
+}
+
 void StartupPostProcess::setToolBarIconSize()
 {
     // set toolbar icon size

src/Gui/StartupProcess.h

@@ -63,6 +63,7 @@ private:
     void setWindowTitle();
     void setProcessMessages();
     void setAutoSaving();
+    void checkQtSvgImageFormatSupport();
     void setToolBarIconSize();
     void setWheelEventFilter();
     void setLocale();