Fix build issues.

src/libs/vformat/vsinglelineoutlinechar.cpp

@@ -79,7 +79,7 @@ Q_REQUIRED_RESULT auto ParseCorrectiosn(const QJsonObject &correctionsObject) ->
 
         if (!segments.isEmpty())
         {
-            corrections->insert(glyph.front(), segments);
+            corrections->insert(Front(glyph), segments);
         }
     }
 

src/libs/vmisc/compatibility.h

@@ -419,4 +419,14 @@ inline auto Back(const QString &str) -> QChar
 #endif
 }
 
+//---------------------------------------------------------------------------------------------------------------------
+inline auto Front(const QString &str) -> QChar
+{
+#if QT_VERSION >= QT_VERSION_CHECK(5, 10, 0)
+    return str.front();
+#else
+    return str.at(0);
+#endif
+}
+
 #endif // COMPATIBILITY_H

src/libs/vmisc/svgfont/vsvgfontengine.cpp

@@ -338,7 +338,7 @@ auto VSvgFontEngine::InFont(QChar ch) const -> bool
 //---------------------------------------------------------------------------------------------------------------------
 auto VSvgFontEngine::CanRender(const QString &str) const -> bool
 {
-    return std::all_of(str.cbegin(), str.cend(), [this](auto c) { return InFont(c); });
+    return std::all_of(str.cbegin(), str.cend(), [this](auto c) { return this->InFont(c); });
 }
 
 //---------------------------------------------------------------------------------------------------------------------