fix(engine): the search keys commit the query they end or replace

Ctrl+E during an emoji search, Ctrl+H during a hanja search, or either
during the other search dropped the typed query, while every other
Ctrl key committed it as the README says. Escape is the way to cancel;
the search keys now commit the shown text like a language switch.

strans.c

@@ -556,15 +556,6 @@ endsearch(void)
 	clearkouho();
 }
 
-/* A search commits any pending composition and takes over the keys. */
-static void
-startsearch(int lang, Str *com)
-{
-	commit(com);
-	endsearch();
-	search.lang = lang;
-}
-
 static void
 commitsearch(Str *com)
 {
@@ -572,6 +563,15 @@ commitsearch(Str *com)
 	endsearch();
 }
 
+/* A search commits whatever is pending and takes over the keys. */
+static void
+startsearch(int lang, Str *com)
+{
+	commit(com);
+	commitsearch(com);
+	search.lang = lang;
+}
+
 static void
 picksearch(int n, Str *com)
 {
@@ -639,15 +639,12 @@ searchkey(u32int ks, u32int mod, Str *com)
 	if(mod & Mctrl){
 		c = ctrlkey(ks);
 		n = searchlang(c);
-		if(n == search.lang)
-			endsearch();
-		else if(n != 0)
+		if(n != 0 && n != search.lang){
 			startsearch(n, com);
-		else{
-			commitsearch(com);
-			return setlang(c);
+			return 1;
 		}
-		return 1;
+		commitsearch(com);
+		return n != 0 || setlang(c);
 	}
 	if(search.raw.n >= Maxrunes){
 		commitsearch(com);