Update text layer correctly when zooming with USE_ONLY_CSS_ZOOM

web/page_view.js

@@ -158,12 +158,13 @@ var PageView = function pageView(container, id, scale,
       // the text layer are rotated.
       // TODO: This could probably be simplified by drawing the text layer in
       // one orientation then rotating overall.
+      var textLayerViewport = this.textLayer.viewport;
       var textRelativeRotation = this.viewport.rotation -
-                                 this.textLayer.viewport.rotation;
+                                 textLayerViewport.rotation;
       var textAbsRotation = Math.abs(textRelativeRotation);
-      var scale = (width / canvas.width);
+      var scale = width / textLayerViewport.width;
       if (textAbsRotation === 90 || textAbsRotation === 270) {
-        scale = width / canvas.height;
+        scale = width / textLayerViewport.height;
       }
       var textLayerDiv = this.textLayer.textLayerDiv;
       var transX, transY;