add preedit to ipc

dat.h

@@ -128,6 +128,7 @@ struct Keyreq
 	int	fd;
 	u32int	ks;
 	u32int	mod;
+	int	want;	/* nonzero: append preedit after commit */
 };
 
 typedef struct Dictreq Dictreq;

srv.c

@@ -11,6 +11,7 @@ sendkey(int fd, u32int ks, u32int mod)
 	kr.fd = fd;
 	kr.ks = ks;
 	kr.mod = mod;
+	kr.want = 0;
 	chansend(keyc, &kr);
 }
 

strans.c

@@ -312,6 +312,13 @@ imthread(void*)
 				out[1] = len;
 				n += len;
 			}
+			if(kr.want){
+				len = im.pre.n > 0 ?
+					stoutf(&im.pre, (char*)(out+n+1),
+						sizeof(out)-n-1) : 0;
+				out[n] = len;
+				n += 1 + len;
+			}
 			write(kr.fd, out, n);
 			break;
 		case 1: