Fix SVG rendering by forcing Tiny12FeaturesOnly

A recent Qt update introduced SVG rendering changes, breaking some icons
(notably TrashDelete.svg, a garbage bin icon used in the
MissionItemEditor that recently started rendering only its lid).

Fixed by forcing the SVG renderer into the previous Tiny 1.2 mode.

This should be reverted once the new renderer fixes these issues, or all
affected SVGs are updated to cope with it.

Author: rubenp02

src/QGCApplication.cc

@@ -22,6 +22,7 @@
 #include <QtQuick/QQuickImageProvider>
 #include <QtQuick/QQuickWindow>
 #include <QtQuickControls2/QQuickStyle>
+#include <QtSvg/QSvgRenderer>
 
 #include <QtCore/private/qthread_p.h>
 
@@ -148,6 +149,9 @@ QGCApplication::QGCApplication(int &argc, char *argv[], const QGCCommandLinePars
     // We need to set language as early as possible prior to loading on JSON files.
     setLanguage();
 
+    // Force old SVG Tiny 1.2 behavior for compatibility
+    QSvgRenderer::setDefaultOptions(QtSvg::Tiny12FeaturesOnly);
+
 #ifndef QGC_DAILY_BUILD
     _checkForNewVersion();
 #endif