vi: enable 'dG' command. Closes 11801

The 'G' command was omitted from the list of commands that change or
delete whole lines.  Add it in the appropriate places so the 'dG',
'cG' and 'yG' commands work, including in cases where an explicit
line number has been supplied.

function                                             old     new   delta
find_range                                           534     596     +62
.rodata                                           175166  175167      +1
------------------------------------------------------------------------------
(add/remove: 0/0 grow/shrink: 2/0 up/down: 63/0)               Total: 63 bytes
Reported-by: NDavid Kelly <david.kelly@liberica.ch>
Signed-off-by: NRon Yorston <rmy@pobox.com>
Signed-off-by: NDenys Vlasenko <vda.linux@googlemail.com>

editors/vi.c

@@ -3001,11 +3001,14 @@ static void do_cmd(int c);
 static int find_range(char **start, char **stop, char c)
 {
 	char *save_dot, *p, *q, *t;
-	int cnt, multiline = 0;
+	int cnt, multiline = 0, forward;
 
 	save_dot = dot;
 	p = q = dot;
 
+	// will a 'G' command move forwards or backwards?
+	forward = cmdcnt == 0 || cmdcnt > count_lines(text, dot);
+
 	if (strchr("cdy><", c)) {
 		// these cmds operate on whole lines
 		p = q = begin_line(p);
@@ -3029,13 +3032,13 @@ static int find_range(char **start, char **stop, char c)
 		if (dot > text && *dot == '\n')
 			dot--;		// stay off NL
 		q = dot;
-	} else if (strchr("H-k{", c)) {
+	} else if (strchr("H-k{", c) || (c == 'G' && !forward)) {
 		// these operate on multi-lines backwards
 		q = end_line(dot);	// find NL
 		do_cmd(c);		// execute movement cmd
 		dot_begin();
 		p = dot;
-	} else if (strchr("L+j}\r\n", c)) {
+	} else if (strchr("L+j}\r\n", c) || (c == 'G' && forward)) {
 		// these operate on multi-lines forwards
 		p = begin_line(dot);
 		do_cmd(c);		// execute movement cmd
@@ -3781,7 +3784,7 @@ static void do_cmd(int c)
 		} else if (strchr("^0bBeEft%$ lh\b\177", c1)) {
 			// partial line copy text into a register and delete
 			dot = yank_delete(p, q, ml, yf, ALLOW_UNDO);	// delete word
-		} else if (strchr("cdykjHL+-{}\r\n", c1)) {
+		} else if (strchr("cdykjGHL+-{}\r\n", c1)) {
 			// whole line copy text into a register and delete
 			dot = yank_delete(p, q, ml, yf, ALLOW_UNDO);	// delete lines
 			whole = 1;