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redraw-frame redisplays the entire contents of a
given frame (see section 29. Frames).
Even more powerful is
Processing user input takes absolute priority over redisplay. If you call these functions when input is available, they do nothing immediately, but a full redisplay does happen eventually--after all the input has been processed.
Normally, suspending and resuming Emacs also refreshes the screen. Some terminal emulators record separate contents for display-oriented programs such as Emacs and for ordinary sequential display. If you are using such a terminal, you might want to inhibit the redisplay on resumption.
nilmeans there is no need to redraw,
nilmeans redrawing is needed. The default is
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