fix to remove need for core plugin to define a default renderMark

docs/reference/plugins/core.md

@@ -29,10 +29,6 @@ The core plugin renders a default block and inline node, wrapping in a `<div>` a
 
 The default block node also controls its own placeholder logic, which is controlled via the [`<Editor>`](../components/editor.md)'s placeholder options.
 
-#### `renderMark`
-
-The core plugin adds a default mark with an empty set of styles.
-
 
 ## Overriding Defaults
 

lib/components/editor.js

@@ -243,6 +243,8 @@ class Editor extends React.Component {
       const style = plugin.renderMark(mark, marks, this.state.state, this)
       if (style) return style
     }
+
+    return {}
   }
 
   /**

lib/plugins/core.js

@@ -101,14 +101,6 @@ function Plugin(options = {}) {
 
   }
 
-  /**
-   * Define a default mark renderer.
-   *
-   * @type {Object}
-   */
-
-  const DEFAULT_MARK = {}
-
   /**
    * Return the plugin.
    */
@@ -291,17 +283,6 @@ function Plugin(options = {}) {
       return node.kind == 'block'
         ? DEFAULT_BLOCK
         : DEFAULT_INLINE
-    },
-
-    /**
-     * The core `mark` renderer, with no styles.
-     *
-     * @param {Mark} mark
-     * @return {Object} style
-     */
-
-    renderMark(mark) {
-      return DEFAULT_MARK
     }
   }
 }