fix paste image twice

public/tinymce/plugins/paste/plugin.js

@@ -621,6 +621,8 @@ define("tinymce/pasteplugin/Clipboard", [
 			
 			if (hasImage(e)) {
 				removePasteBin();
+				// 不然会在内容中插入一个图片, 
+				e.preventDefault();
 				return;
 			}
 
@@ -1189,4 +1191,4 @@ define("tinymce/pasteplugin/Plugin", [
 });
 
 expose(["tinymce/pasteplugin/Utils","tinymce/pasteplugin/WordFilter"]);
-})(this);
+})(this);