reported by mark van atten

	In Plan 9 acme, if you type

	{}

	then go back and type text between the brackets

	{Curiouser and curiouser!}

	the right arrow is blocked when you want to go over the closing
	bracket to continue typing to its right. (If you first go to the left,
	and then back to the right, it works.)

	Same for the other brackets: [ ], ( ), < >.

noted that brackets are not necessary.  same behavior with any
character.

fix is to textcommit before moving.

Reference: /n/atom/patch/applied2013/acmearrowfun
Date: Fri Nov 22 15:40:01 CET 2013
Signed-off-by: quanstro@quanstro.net

--- /sys/src/cmd/acme/text.c	Fri Nov 22 15:38:03 2013
+++ /sys/src/cmd/acme/text.c	Fri Nov 22 15:38:05 2013
@@ -653,16 +653,14 @@
 	rp = &r;
 	switch(r){
 	case Kleft:
-		if(t->q0 > 0){
-			typecommit(t);
+		typecommit(t);
+		if(t->q0 > 0)
 			textshow(t, t->q0-1, t->q0-1, TRUE);
-		}
 		return;
 	case Kright:
-		if(t->q1 < t->file->nc){
-			typecommit(t);
+		typecommit(t);
+		if(t->q1 < t->file->nc)
 			textshow(t, t->q1+1, t->q1+1, TRUE);
-		}
 		return;
 	case Kdown:
 		n = t->maxlines/3;