[#461] clean block issue

[tveronezi]

No description provided.

[WesCossick]

Please provide steps to demonstrate this PR using that JSFiddle.

[tveronezi]

There is also this video, showing how the fix would work.
https://www.youtube.com/watch?v=o0bgeW0D89E

[tveronezi]

Ah, there is also the issue I created a few days ago...
https://github.com/NextStepWebs/simplemde-markdown-editor/issues/461

[sparksuite-bot]

A JSFiddle for this pull request can be found here. If it doesn't inherently demonstrate the proposed change, please fork the fiddle and make the necessary modifications to demonstrate this pull request. Then comment the new URL to your forked fiddle.

[WesCossick]

See: https://jsfiddle.net/oLnmq6zn/2/ for a demonstration.

[WesCossick]

@tveronezi, can you update the PR to just include the change to the /src/ files? It will eliminate the conflicts. Then it can be merged in.

[tveronezi]

@WesCossick I will check this out asap. Thanks.