fix text scale factor

Runtime/painting/text_painter.cs

                     var builder = new ParagraphBuilder(this._createParagraphStyle(TextDirection.ltr)
                     ); // direction doesn't matter, text is just a space
                     if (this.text != null && this.text.style != null) {
-                        builder.pushStyle(this.text.style);
+                        builder.pushStyle(this.text.style, this.textScaleFactor);
                     }
 
                     builder.addText(" ");

Runtime/painting/text_span.cs

         }
 
         public void build(ParagraphBuilder builder, float textScaleFactor = 1.0f) {
-            var hasTyle = this.style != null;
-            if (hasTyle) {
-                builder.pushStyle(this.style);
+            var hasStyle = this.style != null;
+            if (hasStyle) {
+                builder.pushStyle(this.style, textScaleFactor);
             }
 
             if (!string.IsNullOrEmpty(this.text)) {
                 }
             }
 
-            if (hasTyle) {
+            if (hasStyle) {
                 builder.pop();
             }
         }

Runtime/painting/text_style.cs

             this.background = background;
         }
 
-        public ui.TextStyle getTextStyle(ui.TextStyle currentStyle = null) {
+        public ui.TextStyle getTextStyle(ui.TextStyle currentStyle = null, float textScaleFactor = 1.0f) {
-                    fontSize: this.fontSize ?? currentStyle.fontSize,
+                    fontSize: this.fontSize != null ? this.fontSize * textScaleFactor : currentStyle.fontSize,
                     fontWeight: this.fontWeight ?? currentStyle.fontWeight,
                     fontStyle: this.fontStyle ?? currentStyle.fontStyle,
                     letterSpacing: this.letterSpacing ?? currentStyle.letterSpacing,
 
             return new ui.TextStyle(
                 color: this.color,
-                fontSize: this.fontSize,
+                fontSize: this.fontSize * textScaleFactor,
                 fontWeight: this.fontWeight,
                 fontStyle: this.fontStyle,
                 letterSpacing: this.letterSpacing,

Runtime/ui/txt/paragraph_builder.cs

         int _paragraph_style_index;
 
         public interface ITextStyleProvider {
-            TextStyle getTextStyle(TextStyle current = null);
+            TextStyle getTextStyle(TextStyle current = null, float textScaleFactor = 1.0f);
         }
 
         public ParagraphBuilder(ParagraphStyle style) {
             return paragraph;
         }
 
-        public void pushStyle(ITextStyleProvider style) {
-            var newStyle = style.getTextStyle(this.peekStyle());
+        public void pushStyle(ITextStyleProvider style, float textScaleFactor) {
+            var newStyle = style.getTextStyle(this.peekStyle(), textScaleFactor: textScaleFactor);
             var styleIndex = this._runs.addStyle(newStyle);
             this._styleStack.Add(styleIndex);
             this._runs.startRun(styleIndex, this._text.Length);