1 files changed, 32 insertions, 5 deletions

diff --git a/sources/core/filter.js b/sources/core/filter.js
index db68530..3e64fc5 100644
--- a/sources/core/filter.js
+++ b/sources/core/filter.js
@@ -158,7 +158,8 @@
                         },
                         // Object: element name => array of transformations groups.
                         transformations: {},
-                        cachedTests: {}
+                        cachedTests: {},
+                        cachedChecks: {}
                 };
 
                 // Register filter instance.
@@ -299,7 +300,7 @@
                                         if ( el.attributes[ 'data-cke-filter' ] == 'off' )
                                                 return false;
 
-                                        // (#10260) Don't touch elements like spans with data-cke-* attribute since they're
+                                        // (http://dev.ckeditor.com/ticket/10260) Don't touch elements like spans with data-cke-* attribute since they're
                                         // responsible e.g. for placing markers, bookmarks, odds and stuff.
                                         // We love 'em and we don't wanna lose anything during the filtering.
                                         // '|' is to avoid tricky joints like data-="foo" + cke-="bar". Yes, they're possible.
@@ -346,7 +347,7 @@
                                 if ( !element.parent )
                                         continue;
 
-                                // Handle custom elements as inline elements (#12683).
+                                // Handle custom elements as inline elements (http://dev.ckeditor.com/ticket/12683).
                                 parentDtd = DTD[ element.parent.name ] || DTD.span;
 
                                 switch ( check.check ) {
@@ -806,6 +807,32 @@
                 } )(),
 
                 /**
+                 * Returns a clone of this filter instance.
+                 *
+                 * @since 4.7.3
+                 * @returns {CKEDITOR.filter}
+                 */
+                clone: function() {
+                        var ret = new CKEDITOR.filter(),
+                                clone = CKEDITOR.tools.clone;
+
+                        // Cloning allowed content related things.
+                        ret.allowedContent = clone( this.allowedContent );
+                        ret._.allowedRules = clone( this._.allowedRules );
+
+                        // Disallowed content rules.
+                        ret.disallowedContent = clone( this.disallowedContent );
+                        ret._.disallowedRules = clone( this._.disallowedRules );
+
+                        ret._.transformations = clone( this._.transformations );
+
+                        ret.disabled = this.disabled;
+                        ret.editor = this.editor;
+
+                        return ret;
+                },
+
+                /**
                  * Destroys the filter instance and removes it from the global {@link CKEDITOR.filter#instances} object.
                  *
                  * @since 4.4.5
@@ -2201,7 +2228,7 @@
                         var widths = element.styles.margin.match( /(\-?[\.\d]+\w+)/g ) || [ '0px' ];
                         switch ( widths.length ) {
                                 case 1:
-                                        element.styles.margin = widths[0];
+                                        mapStyles( [ 0, 0, 0, 0 ] );
                                         break;
                                 case 2:
                                         mapStyles( [ 0, 1, 0, 1 ] );
@@ -2291,7 +2318,7 @@
  *      * {@link CKEDITOR.filter.allowedContentRules} – defined rules will be added
  *      to the {@link CKEDITOR.editor#filter}.
  *      * `true` – will disable the filter (data will not be filtered,
- *      all features will be activated).
+ *      all features will be activated). Reading [security best practices](#!/guide/dev_best_practices) before setting `true` is recommended.
  *      * default – the filter will be configured by loaded features
  *      (toolbar items, commands, etc.).
  *