pub(crate) fn floor_cursor(page: &mut Page, dropped: usize)Expand description
Hand the window’s floor back as a page’s cursor when the page opens on the window’s front (#2420).
The window’s own start is not the history’s: a page cut there carries
no handle of its own while the history above it begins at the floor. Both
a more answer and the session record serve that page, and both must hand
the same handle back or a client reads the history above as ended.