Remove _doLayout.

Runtime/ui/txt/layout.cs

             }
         }
 
-        public static float doLayout(float offset, string text, int start, int count, float[] advances, float[] positions, TextStyle style, TabStops tabStops, out UnityEngine.Rect bounds) {
-            return _doLayout(offset, text, start, count, style, advances, positions, 0,
-                tabStops, out bounds);
-        }
-
-        static float _doLayout(float offset, string text, int start, int count, TextStyle style,
+        public static float doLayout(float offset, string text, int start, int count, TextStyle style,
             float[] advances, float[] positions, int advanceOffset, TabStops tabStops, out UnityEngine.Rect bounds) {
             float advance = 0;
             Font font = FontManager.instance.getOrCreate(style.fontFamily, style.fontWeight, style.fontStyle).font;

Runtime/ui/txt/paragraph.cs

             if (positions == null || positions.Length < textCount) {
                 positions = new float[textCount];
             }
-            float advance = Layout.doLayout(runXOffset, text, textStart, textCount, advances, positions, run.style, this._tabStops, out var bounds);
+            float advance = Layout.doLayout(runXOffset, text, textStart, textCount, run.style, advances, positions, 
+                0, this._tabStops, out var bounds);
 
             builder.allocRunPos(run.style, text, textStart, textCount);
             // bounds relative to first character