(redraw [ename [mode]])
Redraw the viewport or just a single entity.
This function redraws (or refreshes) the entire graphic display screen, or a single entity. Any temporary graphics present (such as those drawn with the grdraw function) disappear with this function.
If an ename (short for entity name) argument is entered, that entity is displayed differently, depending on the value specified in the mode argument:
When these values are entered as negative numbers, the function affects only the main part of a complex element (for example, a block or polyline). The sub-elements are not affected. This function always returns nil.
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