Andrew Kelley 5c0ac90721 std: fix File.Writer sendfile with buffered contents
* File.Writer.seekBy passed wrong offset to setPosAdjustingBuffer.
* File.Writer.sendFile incorrectly used non-logical position.

Related to 1d764c1fdf04829cec5974d82cec901825a80e49

Test case provided by:

Co-authored-by: Kendall Condon <goon.pri.low@gmail.com>
2025-10-09 12:04:10 -07:00
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