`resolve-conflicts` may remove unrelated `===================` strings #4673

Please ensure:

• The bug is caused by Refined GitHub. It doesn't happen if I disable the extension.

Description

From https://github.com/sindresorhus/refined-github/issues/4672 by @szmarczak

Sometimes it doesn't work correctly and leads to something like this: 533e423 (#1118) (removal of ====================)

Screenshot

<img width="448" alt="Screen Shot" src="https://user-images.githubusercontent.com/1402241/129766314-f90e4cad-27dd-422a-9d41-8dd90848496a.png">

Console errors

No response

Example URL

Any merge conflict page, like https://github.com/sindresorhus/refined-github/pull/148/conflicts

Browser(s) used

unknown