Merge pull request #1140 from MariusVolkhart/mv/935

[IMPROVEMENT] Only allow Openable content in Storage Access Framework

app/src/main/java/chat/rocket/android/chatroom/ui/ChatRoomFragment.kt

@@ -467,6 +467,7 @@ class ChatRoomFragment : Fragment(), ChatRoomView, EmojiKeyboardListener, EmojiR
             val intent = Intent(Intent.ACTION_GET_CONTENT)
             intent.type = "*/*"
             intent.putExtra(Intent.EXTRA_MIME_TYPES, filter)
+            intent.addCategory(Intent.CATEGORY_OPENABLE)
             startActivityForResult(intent, REQUEST_CODE_FOR_PERFORM_SAF)
         }
     }