Fixed backspace syncState issue
Fixed backspace syncState issue

catalinmiron/react-tinymce-mention,catalinmiron/react-tinymce-mention,Kindling/react-tinymce-mention,catalinmiron/react-tinymce-mention,Kindling/react-tinymce-mention,Kindling/react-tinymce-mentions,Kindling/react-tinymce-mentions,Kindling/react-tinymce-mentions,Kindling/react-tinymce-mention