Symptoms
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When opening a file in Plesk Code Editor, large gaps appear between the lines:
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The Atomic Secured Linux extension is enabled in Plesk at Extensions > My Extensions > Atomic Secured Linux.
Cause
Atomic Secured Linux extension bug with ID EXTCERT-3863, which has been fixed in version 1.5-1.
Resolution
Update the Atomic Secured Linux extension: How to manage Plesk extensions (install, disable, remove, update)