Do not change the file content when it is opend

[deathrush]

Describe your feature request

Now the software will automatically change the lines of a existing file.

I hope it will no longer change the opened files.

What problem does this feature solve? [optional]

Even if I doesn't change any character, when closing it, the software need I to confirm the change.

[Jocs]

duplicate with #912 ?

[fxha]

Mark Text automatically formats the document and from version 0.16.0 we automatically identify the trailing newline mode.