Add functions SetContentLineCount and OverwriteLinesAndClearEverythingElse #53
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There is no need to overwrite things with spaces; since tcell clears the whole surface before drawing, it is enough to just truncate the line at the current write position.
It is similar to OverwriteLines, except that it also clears all lines outside of the area that was rerendered. This is needed for views that only draw the visible portion of their model, to ensure that cells for invisble lines don't accumulate as you scroll.
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Needed for jesseduffield/lazygit#2533, and reviewed as part of it.