input: don't print warning if certain internal keys are not bound

This affects MOUSE_MOVE and MOUSE_LEAVE. Both are needed internally
(such as for the OSC), but not really useful for input.conf. Since the
warning has the purpose of notifying the user that a key is unmapped and
what key name to use for setting up a binding in input.conf, the warning
is rather useless in this case. It's also annoying in combination with
the
--no-input-default-bindings option, since that removes the default
bindings to "ignore" for these keys.

etc/input.conf

@@ -185,10 +185,6 @@
 #JOY_BTN2 add volume 1
 #JOY_BTN3 add volume -1
 
-# Mostly for internal purposes
-#MOUSE_MOVE ignore
-#MOUSE_LEAVE ignore
-
 #
 # Not assigned by default
 # (not an exhaustive list of unbound commands)

mpvcore/input/input.c

@@ -1363,9 +1363,12 @@ static mp_cmd_t *get_cmd_from_keys(struct input_ctx *ictx, char *force_section,
     }
 
     if (cmd == NULL) {
+        int msgl = MSGL_WARN;
+        if (n == 1 && (keys[0] == MP_KEY_MOUSE_MOVE ||
+                       keys[0] == MP_KEY_MOUSE_LEAVE))
+            msgl = MSGL_DBG2;
         char *key_buf = get_key_combo_name(keys, n);
-        mp_tmsg(MSGT_INPUT, MSGL_WARN,
-                "No bind found for key '%s'.\n", key_buf);
+        mp_tmsg(MSGT_INPUT, msgl, "No bind found for key '%s'.\n", key_buf);
         talloc_free(key_buf);
         return NULL;
     }