Fixed scroll position after code reformatting

[3ru]

[Fixes #] No issues have been created. (If it is required, I will create it.)

Motivation

If the cursor position is misaligned after code reformatting, it is difficult to see where one's cursor has been sent. In fact, the cursor position is comfortably maintained in regular code editors (VSCode, JetBrains, etc.), even when running code reformatting.

I have also seen several people on youtube asking for this problem to be fixed.

Changes

Fixed by obtaining the scroll position before code reformatting and scrolling to that position after reformatting.

Demo

Before	After
ab88bb7deb6ce7c825f5cf04187e0659.mp4	5fe0cf3a7485c361de30128216b05982.mp4

Checklist

• has no linting errors (npm run lint)
• has no test errors (npm run test)
• is from a uniquely-named feature branch and is up to date with the develop branch.
• is descriptively named and links to an issue number, i.e. Fixes #123

Ref

• CodeMirror doc

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