fix(cellbuf): wrap when the cursor is at the end of the window

Fixes: cbdcc21 (fix(cellbuf): SetContent should truncate the string if it doesn't fit in the window)

cellbuf/window.go

@@ -275,7 +275,7 @@ func (c *Window) drawString(s string, x, y int, opts *drawOpts) {
 				cell = newGraphemeCell(seq, width)
 			}
 
-			if !opts.truncate && x+width > c.x+c.w {
+			if !opts.truncate && x >= c.w {
 				// Auto wrap the cursor.
 				wrapCursor()
 				if y >= c.h {