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plan9: don't clear manual command buffer

--- a/plan9.c

+++ b/plan9.c

@@ -447,9 +447,13 @@

 static void

 command(char *s, void (*snapshot)(void))

 {

+	char tmp[256];

 	char *a;

 	int x, y;

+	snprint(tmp, sizeof(tmp), "%s", s);

+	s = tmp;

+

 	if (s[0] == ',') {

 		snapshot();

 		cur = ZP;

@@ -1161,6 +1165,7 @@

 	Mouse m;

 	Point p;

 	char tmp[256];

+	char cmd[256];

 	int oldw, oldh, w, h, n, oldbuttons;

 	long seed;

 	bool complete;

@@ -1296,6 +1301,7 @@

 	move.x = 1;

 	move.y = 1;

 	oldbuttons = 0;

+	cmd[0] = 0;

 	netdial(nil, nil);

 	midiopen(nil);

@@ -1524,9 +1530,8 @@

 				mode = mode != Mappend ? Mappend : Minsert;

 				break;

 			case 0x0b: /* C-k */

-				tmp[0] = 0;

-				if (enter("command:", tmp, sizeof(tmp), nil, &kctl, nil) > 0)

-					command(tmp, snapshot);

+				if (enter("command:", cmd, sizeof(cmd), nil, &kctl, nil) > 0)

+					command(cmd, snapshot);

 				break;

 			case Kesc:

 				if (mode == Mslide || mode != Minsert)