display: revamp how screen updates are done in the movement code
When the screen is narrower than a tab is wide, the cursor does not need to be on the first/last line of the window before an <Up>/<Down> could need to scroll the screen. This fixes http://savannah.gnu.org/bugs/?51776 . Reported-by:David Lawrence Ramsey <pooka109@gmail.com>
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+18 -88
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