Media Library and Page Slug conflict

[m7csat]

This is a follow-up to #18962.

Please also check out this thread on the forum - ​https://wordpress.org/support/topic/41-slug-issue-when-same-title-exists-in-media-library

If you have a pre-existing media file with the same slug as a page then a "-2" will be added to the page slug. With a custom content type and page or custom content type and media file, this doesn't appear to be happening.

[SergeyBiryukov]

Related: #13459, #15665, #24612.