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winwatch: this is not about sanity. rows might be negative

--- a/sys/src/cmd/winwatch.c

+++ b/sys/src/cmd/winwatch.c

@@ -188,7 +188,7 @@

 	z = 0;

 	rows = (Dy(screen->r)-2*MARGIN+PAD)/(font->height+PAD);

-	if(rows == 0)

+	if(rows <= 0)

 		rows = 1;

 	if(rows*cols < nwin || rows*cols >= nwin*2){

 		ncols = nwin <= 0 ? 1 : (nwin+rows-1)/rows;

-- 

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