refactor core onPaste handler

lib/plugins/core.js

@@ -284,18 +284,21 @@ function Plugin(options = {}) {
      */
 
     onPaste(e, paste, state, editor) {
-      if (paste.type == 'files') return
+      switch (paste.type) {
+        case 'text':
+        case 'html': {
+          let transform = state.transform()
 
-      let transform = state.transform()
+          paste.text
+            .split('\n')
+            .forEach((line, i) => {
+              if (i > 0) transform = transform.splitBlock()
+              transform = transform.insertText(line)
+            })
 
-      paste.text
+          return transform.apply()
-        .split('\n')
+        }
-        .forEach((line, i) => {
+      }
-          if (i > 0) transform = transform.splitBlock()
-          transform = transform.insertText(line)
-        })
-
-      return transform.apply()
     },
 
     /**