Dion Hulse 85258bb914 In insert_with_markers() restore the 4.3 behaviour of creating the file if it doesn't exist.
This change also makes it bail early (without writing) if the markers content is the same as the existing, and uses `ftell()` rather than `$bytes` for the location to truncate the file to - based on the file pointer being at the end of the written stream.

Props willmot tigertech kevinatelement
See #31767

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git-svn-id: http://core.svn.wordpress.org/trunk@35233 1a063a9b-81f0-0310-95a4-ce76da25c4cd
2015-10-19 00:53:24 +00:00
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