change Fontsize to double

lib/models/documents/attribute.dart

@@ -201,8 +201,8 @@ class StrikeThroughAttribute extends Attribute<bool> {
   StrikeThroughAttribute() : super('strike', AttributeScope.INLINE, true);
 }
 
-class FontAttribute extends Attribute<String> {
-  FontAttribute(String val) : super('font', AttributeScope.INLINE, val);
+class FontAttribute extends Attribute<double> {
+  FontAttribute(double val) : super('font', AttributeScope.INLINE, val);
 }
 
 class SizeAttribute extends Attribute<String> {

lib/widgets/text_selection.dart

@@ -202,11 +202,11 @@ class EditorTextSelectionOverlay {
             context,
             editingRegion,
             baseLineHeight,
-            midpoint,
+              Offset(0, 0),// midpoint,
             endpoints,
             selectionDelegate,
             clipboardStatus,
-            Offset(0, 0)),
+          ),
       ),
     );
   }