Display line numbers in edit mode
If you want to fix bugs (e.g.), it would be very handy to have the line numbers in edit mode.

Can you clarify what scenario you are asking about? Could code editor be used in this case? Please explain your request in more detail.
Upd: since this functionality is available in Plesk 12.5 out of the box (as Code Editor), we are closing this request as already done.
—AK
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Have you tried Code Editor for that purpose? It shows line numbers and syntax highlighting. The feature is available in Plesk 12.5 out of the box.
— ES
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Anonymous commented
in Plesk you can open files to edit them. but unfortunately there are no line numbers...and unfortunately I have no possibility to add a screenshot here....