refactor: floatify messages (#6231)

src/singletons/Fonts.hpp

@@ -46,7 +46,7 @@ public:
     // font data gets set in createFontData(...)
 
     QFont getFont(FontStyle type, float scale);
-    QFontMetrics getFontMetrics(FontStyle type, float scale);
+    QFontMetricsF getFontMetrics(FontStyle type, float scale);
 
     pajlada::Signals::NoArgSignal fontChanged;
 
@@ -59,7 +59,7 @@ private:
         }
 
         const QFont font;
-        const QFontMetrics metrics;
+        const QFontMetricsF metrics;
     };
 
     struct ChatFontData {