refactor core onPaste handler

lib/plugins/core.js

@@ -284,8 +284,9 @@ function Plugin(options = {}) {
      */
 
     onPaste(e, paste, state, editor) {
-      if (paste.type == 'files') return
-
+      switch (paste.type) {
+        case 'text':
+        case 'html': {
           let transform = state.transform()
 
           paste.text
@@ -296,6 +297,8 @@ function Plugin(options = {}) {
             })
 
           return transform.apply()
+        }
+      }
     },
 
     /**