drochner
3d545acb51
Overload the generic "copyrows" function by a private one which implents
a "fast scroll" by setting the display start in memory. (Only implemented for "scroll up" because this is more used. "scroll down" is easy to add.) This moves the semantics of "copyrows" to something like "moverows"; the contents of the new visible lines at the bottom is undefined. The emulations can live without the original "copy" semantics.
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