Fix behavior of ')' used in a range when setence reaches EOF.

For a sentence spanning more than one line at the end of the file,
when the cursor is placed at the first character of any line except
for the last one, running '!)<cmd>' won't affect the last line.

From Walter Alejandro Iglesias

usr.bin/vi/vi/v_sentence.c

@@ -1,4 +1,4 @@
-/*	$OpenBSD: v_sentence.c,v 1.11 2026/04/25 19:30:59 millert Exp $	*/
+/*	$OpenBSD: v_sentence.c,v 1.12 2026/06/16 02:15:14 millert Exp $	*/
 
 /*-
  * Copyright (c) 1992, 1993, 1994
@@ -175,8 +175,20 @@ okret:	vp->m_stop.lno = cs.cs_lno;
 	 * range for motion commands.
 	 */
 	if (ISMOTION(vp)) {
-		if (vp->m_start.cno == 0 &&
+		if (cs.cs_flags == CS_EOF) {
+			/*
+			 * If EOF is reached, maintain the stop position
+			 * at the very end of the file (cs_len - 1) instead
+			 * of decrementing it.
+			 */
+			vp->m_stop.lno = cs.cs_lno;
+			vp->m_stop.cno = cs.cs_len > 0 ? cs.cs_len - 1 : 0;
+		} else if (vp->m_start.cno == 0 &&
 		    (cs.cs_flags != 0 || vp->m_stop.cno == 0)) {
+			/*
+			 * If in line mode, adjust stop to the end of
+			 * the previous line.
+			 */
 			if (vp->m_start.lno < vp->m_stop.lno) {
 				if (db_get(sp,
 				    --vp->m_stop.lno, DBG_FATAL, NULL, &len))
@@ -184,11 +196,13 @@ okret:	vp->m_stop.lno = cs.cs_lno;
 				vp->m_stop.cno = len ? len - 1 : 0;
 			}
 			F_SET(vp, VM_LMODE);
-		} else
+		} else if (vp->m_stop.cno > 0) {
 			--vp->m_stop.cno;
+		}
 		vp->m_final = vp->m_start;
-	} else
+	} else {
 		vp->m_final = vp->m_stop;
+	}
 	return (0);
 }