xreadline ctrl-w memmove less

Author: doremiyeon

src/nnn.c

@@ -3716,13 +3716,17 @@ static char *xreadline(const char *prefill, const char *prompt)
 				continue;
 			case CONTROL('W'):
 				printmsg(prompt);
+				lpos = pos;
 				do {
-					if (pos == 0)
+					if (pos <= 0)
 						break;
-					memmove(buf + pos - 1, buf + pos,
-						(len - pos) * WCHAR_T_WIDTH);
-					--pos, --len;
+					--pos;
 				} while (buf[pos - 1] != ' ' && buf[pos - 1] != '/'); // NOLINT
+				if (pos < lpos) {
+					if (len > lpos)
+						memmove(buf + pos, buf + lpos, (len - lpos) * WCHAR_T_WIDTH);
+					len -= lpos - pos;
+				}
 				continue;
 			case CONTROL('K'):
 				printmsg(prompt);