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cp: do not skip tabs after .if condition

Reported by Dirk-Wilhelm Peters <peters@schwertfisch.de>.

--- a/cp.c

+++ b/cp.c

@@ -242,10 +242,10 @@

 			c = cp_raw();

 	} else {

 		int c = cp_next();

-		while ((c == ' ' || c == '\t'))

+		while (c == ' ')

 			c = cp_next();

 		/* push back if the space is not inserted due to \{ and \} */

-		if (c != ' ' && c != '\t')

+		if (c != ' ')

 			cp_back(c);

 	}

 }