In this pull request we just adding action to pendingAction collection after user click on submit button and removing that action after editor is restarted. While any action is in pendingAction collection, button submit will be disabled, what preventing possibility clicking on that again.
### Suggested merge commit message ([convention](https://ckeditor.com/docs/ckeditor5/latest/framework/guides/contributing/git-commit-message-convention.html))
Fix ( Github Writer ): Double submit when commenting. Closes #227.
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### Additional information
In this pull request we just adding action to pendingAction collection after user click on submit button and removing that action after editor is restarted. While any action is in pendingAction collection, button submit will be disabled, what preventing possibility clicking on that again.