recent changes breaking scroll-preserve-screen-position (with header-line on)?

[Jens Lautenbacher]

Hi,

it seems that some recent changes (not longer ago than ~1-2 weeks) broke
scroll-preserve-screen-position again when using a header line. The
cursor stays on it's position when scrolling down (== moving the
scrollbar down), but jumps up two line when scrolling up (== scrollbar
moves up). 

-- 
        jtl

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