fix: retain the newest dictionary request

strans.c

@@ -135,7 +135,7 @@ reset(void)
 void
 dictsend(Im *im, Str *key)
 {
-	Dictreq req;
+	Dictreq old, req;
 
 	req.key = *key;
 	req.lang = im->l->lang;
@@ -143,6 +143,9 @@ dictsend(Im *im, Str *key)
 		jpreading(im, &req.pre);
 	else
 		req.pre = im->pre;
+	/* imthread is the sole producer; discard every obsolete queued lookup. */
+	while(channbrecv(dictreqc, &old) > 0)
+		;
 	channbsend(dictreqc, &req);
 }
 
@@ -271,7 +274,6 @@ static int
 dotrans(Rune c, Str *com)
 {
 	Emit e;
-	Dictreq req;
 	Str mapped;
 
 	if(isjp(&im))
@@ -297,10 +299,7 @@ dotrans(Rune c, Str *com)
 	sclear(&im.pre);
 	sappend(&im.pre, &e.next);
 	if(e.eat && e.dict.n > 0){
-		req.key = e.dict;
-		req.lang = im.l->lang;
-		req.pre = im.pre;
-		channbsend(dictreqc, &req);
+		dictsend(&im, &e.dict);
 	}
 	return e.eat;
 }
@@ -626,7 +625,7 @@ keystroke(u32int ks, u32int mod, Str *com)
 	off = 0;
 	if(im.sel >= Maxdisp)
 		off = im.sel - Maxdisp + 1;
-	if(n >= 0 && n < Maxdisp && off + n < im.nkouho){
+	if(n >= 0 && n < Maxdisp && off + n < im.nkouho && mod == 0){
 		sappend(com, &im.kouho[off + n]);
 		reset();
 		return 1;