I've seen a few older, closed issues describing similar problems, but none seem to mention "custom formatting options" being a problem.

See attached screenshot.

When multiple of the "Break line after" or "Break line before" boxes are checked, the editor can exponentially insert line breaks to a page on each save.

The first time I saved a with one line of text. The editor inserted three line breaks. Then the next time I saved the page, each of those new lines got three line breaks of their own.

Making multiple edits to the page, this problem could escalate quickly and cause performance issues.

I was able to resolve the issue by unchecking all of the "Break line" options under the "Custom formatting options" window in the ckeditor configuration.

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mrdrewkeller created an issue.