Remove the 14px adjustment to textarea autoheight

core/modules/editor/engines/framed.js

@@ -162,13 +162,13 @@ FramedEngine.prototype.fixHeight = function() {
 		if(this.widget.editAutoHeight) {
 			if(this.domNode && !this.domNode.isTiddlyWikiFakeDom) {
 				var newHeight = $tw.utils.resizeTextAreaToFit(this.domNode,this.widget.editMinHeight);
-				this.iframeNode.style.height = (newHeight + 14) + "px"; // +14 for the border on the textarea
+				this.iframeNode.style.height = newHeight + "px";
 			}
 		} else {
 			var fixedHeight = parseInt(this.widget.wiki.getTiddlerText(HEIGHT_VALUE_TITLE,"400px"),10);
 			fixedHeight = Math.max(fixedHeight,20);
 			this.domNode.style.height = fixedHeight + "px";
-			this.iframeNode.style.height = (fixedHeight + 14) + "px";
+			this.iframeNode.style.height = fixedHeight + "px";
 		}
 	}
 };