From 24916f2f6e4480143f0de026a727cc524fb797a8 Mon Sep 17 00:00:00 2001
From: nicm <nicm>
Date: Wed, 23 Nov 2016 16:44:42 +0000
Subject: [PATCH 1/2] Error on invalid modifier keys.

---
 key-string.c | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/key-string.c b/key-string.c
index d513ec6f..9ee1c2d2 100644
--- a/key-string.c
+++ b/key-string.c
@@ -140,6 +140,9 @@ key_string_get_modifiers(const char **string)
 		case 's':
 			modifiers |= KEYC_SHIFT;
 			break;
+		default:
+			*string = NULL;
+			return 0;
 		}
 		*string += 2;
 	}
@@ -179,7 +182,7 @@ key_string_lookup_string(const char *string)
 		string++;
 	}
 	modifiers |= key_string_get_modifiers(&string);
-	if (string[0] == '\0')
+	if (string == NULL || string[0] == '\0')
 		return (KEYC_UNKNOWN);
 
 	/* Is this a standard ASCII key? */

From 6de466cf8b665d8725301307c57f6d8cb2e65a3f Mon Sep 17 00:00:00 2001
From: nicm <nicm>
Date: Wed, 23 Nov 2016 17:01:24 +0000
Subject: [PATCH 2/2] For mouse keys, use the mouse pane as the default current
 pane.

---
 key-bindings.c  |  4 ++--
 server-client.c | 16 +++++++++++++++-
 tmux.h          |  2 +-
 3 files changed, 18 insertions(+), 4 deletions(-)

diff --git a/key-bindings.c b/key-bindings.c
index d07c7b49..9bc61b62 100644
--- a/key-bindings.c
+++ b/key-bindings.c
@@ -396,7 +396,7 @@ key_bindings_read_only(struct cmdq_item *item, __unused void *data)
 
 void
 key_bindings_dispatch(struct key_binding *bd, struct client *c,
-    struct mouse_event *m)
+    struct mouse_event *m, struct cmd_find_state *fs)
 {
 	struct cmd	*cmd;
 	int		 readonly;
@@ -409,5 +409,5 @@ key_bindings_dispatch(struct key_binding *bd, struct client *c,
 	if (!readonly && (c->flags & CLIENT_READONLY))
 		cmdq_append(c, cmdq_get_callback(key_bindings_read_only, NULL));
 	else
-		cmdq_append(c, cmdq_get_command(bd->cmdlist, NULL, m, 0));
+		cmdq_append(c, cmdq_get_command(bd->cmdlist, fs, m, 0));
 }
diff --git a/server-client.c b/server-client.c
index e2d1c5d9..fbe14e82 100644
--- a/server-client.c
+++ b/server-client.c
@@ -692,6 +692,7 @@ server_client_handle_key(struct client *c, key_code key)
 	struct key_table	*table;
 	struct key_binding	 bd_find, *bd;
 	int			 xtimeout;
+	struct cmd_find_state	 fs;
 
 	/* Check the client is good to accept input. */
 	if (s == NULL || (c->flags & (CLIENT_DEAD|CLIENT_SUSPENDED)) != 0)
@@ -804,8 +805,21 @@ retry:
 		}
 		server_status_client(c);
 
+		/* Find default state if the pane is known. */
+		cmd_find_clear_state(&fs, NULL, 0);
+		if (wp != NULL) {
+			fs.s = s;
+			fs.wl = fs.s->curw;
+			fs.w = fs.wl->window;
+			fs.wp = wp;
+			cmd_find_log_state(__func__, &fs);
+
+			if (!cmd_find_valid_state(&fs))
+				fatalx("invalid key state");
+		}
+
 		/* Dispatch the key binding. */
-		key_bindings_dispatch(bd, c, m);
+		key_bindings_dispatch(bd, c, m, &fs);
 		key_bindings_unref_table(table);
 		return;
 	}
diff --git a/tmux.h b/tmux.h
index 18ff4bbb..47be55b5 100644
--- a/tmux.h
+++ b/tmux.h
@@ -1835,7 +1835,7 @@ void	 key_bindings_remove(const char *, key_code);
 void	 key_bindings_remove_table(const char *);
 void	 key_bindings_init(void);
 void	 key_bindings_dispatch(struct key_binding *, struct client *,
-	     struct mouse_event *);
+	     struct mouse_event *, struct cmd_find_state *);
 
 /* key-string.c */
 key_code	 key_string_lookup_string(const char *);