diff --git a/cmd-find.c b/cmd-find.c
index 07a3c7a3..3d129875 100644
--- a/cmd-find.c
+++ b/cmd-find.c
@@ -50,6 +50,7 @@ struct cmd_find_state {
 	int			 idx;
 };
 
+struct session	*cmd_find_try_TMUX(struct client *, struct window *);
 int		 cmd_find_client_better(struct client *, struct client *);
 struct client	*cmd_find_best_client(struct client **, u_int);
 int		 cmd_find_session_better(struct session *, struct session *,
@@ -108,6 +109,33 @@ const char *cmd_find_pane_table[][2] = {
 	{ NULL, NULL }
 };
 
+/* Get session from TMUX if present. */
+struct session *
+cmd_find_try_TMUX(struct client *c, struct window *w)
+{
+	struct environ_entry	*envent;
+	char			 tmp[256];
+	long long		 pid;
+	u_int			 session;
+	struct session		*s;
+
+	envent = environ_find(&c->environ, "TMUX");
+	if (envent == NULL)
+		return (NULL);
+
+	if (sscanf(envent->value, "%255[^,],%lld,%d", tmp, &pid, &session) != 3)
+		return (NULL);
+	if (pid != getpid())
+		return (NULL);
+	log_debug("client %d TMUX is %s (session @%u)", c->ibuf.fd,
+	    envent->value, session);
+
+	s = session_find_by_id(session);
+	if (s == NULL || (w != NULL && !session_has(s, w)))
+		return (NULL);
+	return (s);
+}
+
 /* Is this client better? */
 int
 cmd_find_client_better(struct client *c, struct client *than)
@@ -191,6 +219,12 @@ cmd_find_best_session_with_window(struct cmd_find_state *fs)
 	u_int		  ssize;
 	struct session	 *s;
 
+	if (fs->cmdq->client != NULL) {
+		fs->s = cmd_find_try_TMUX(fs->cmdq->client, fs->w);
+		if (fs->s != NULL)
+			return (cmd_find_best_winlink_with_window(fs));
+	}
+
 	ssize = 0;
 	RB_FOREACH(s, sessions, &sessions) {
 		if (!session_has(s, fs->w))
@@ -276,7 +310,9 @@ cmd_find_current_session_with_client(struct cmd_find_state *fs)
 	return (0);
 
 unknown_pane:
-	fs->s = cmd_find_best_session(NULL, 0, fs->flags);
+	fs->s = cmd_find_try_TMUX(fs->cmdq->client, NULL);
+	if (fs->s == NULL)
+		fs->s = cmd_find_best_session(NULL, 0, fs->flags);
 	if (fs->s == NULL)
 		return (-1);
 	fs->wl = fs->s->curw;
diff --git a/cmd-new-session.c b/cmd-new-session.c
index 7687398e..b3bf3c74 100644
--- a/cmd-new-session.c
+++ b/cmd-new-session.c
@@ -133,7 +133,7 @@ cmd_new_session_exec(struct cmd *self, struct cmd_q *cmdq)
 				    strerror(errno));
 				return (CMD_RETURN_ERROR);
 			}
-		} else if (cp != NULL)
+		} else
 			free(cp);
 		cwd = fd;
 	} else if (c != NULL && c->session == NULL)
diff --git a/cmd-new-window.c b/cmd-new-window.c
index 9cead449..893fe6e2 100644
--- a/cmd-new-window.c
+++ b/cmd-new-window.c
@@ -107,7 +107,7 @@ cmd_new_window_exec(struct cmd *self, struct cmd_q *cmdq)
 				    strerror(errno));
 				return (CMD_RETURN_ERROR);
 			}
-		} else if (cp != NULL)
+		} else
 			free(cp);
 		cwd = fd;
 	} else if (cmdq->client != NULL && cmdq->client->session == NULL)
diff --git a/cmd-split-window.c b/cmd-split-window.c
index 50799cff..99da5f1c 100644
--- a/cmd-split-window.c
+++ b/cmd-split-window.c
@@ -100,7 +100,7 @@ cmd_split_window_exec(struct cmd *self, struct cmd_q *cmdq)
 				    strerror(errno));
 				return (CMD_RETURN_ERROR);
 			}
-		} else if (cp != NULL)
+		} else
 			free(cp);
 		cwd = fd;
 	} else if (cmdq->client != NULL && cmdq->client->session == NULL)
diff --git a/format.c b/format.c
index acfcb531..4b15e0fa 100644
--- a/format.c
+++ b/format.c
@@ -1022,7 +1022,7 @@ format_defaults_pane(struct format_tree *ft, struct window_pane *wp)
 {
 	struct grid	*gd = wp->base.grid;
 	u_int		 idx;
-	int  		 status;
+	int  		 status, scroll_position;
 
 	if (ft->w == NULL)
 		ft->w = wp->window;
@@ -1070,6 +1070,10 @@ format_defaults_pane(struct format_tree *ft, struct window_pane *wp)
 	format_add(ft, "scroll_region_upper", "%u", wp->base.rupper);
 	format_add(ft, "scroll_region_lower", "%u", wp->base.rlower);
 
+	scroll_position = window_copy_scroll_position(wp);
+	if (scroll_position != -1)
+		format_add(ft, "scroll_position", "%d", scroll_position);
+
 	format_add(ft, "alternate_on", "%d", wp->saved_grid ? 1 : 0);
 	format_add(ft, "alternate_saved_x", "%u", wp->saved_cx);
 	format_add(ft, "alternate_saved_y", "%u", wp->saved_cy);
diff --git a/server-client.c b/server-client.c
index 960c5630..08bf5024 100644
--- a/server-client.c
+++ b/server-client.c
@@ -597,7 +597,7 @@ server_client_handle_key(struct client *c, int key)
 		m->valid = 0;
 
 	/* Treat everything as a regular key when pasting is detected. */
-	if (server_client_assume_paste(s)) {
+	if (!KEYC_IS_MOUSE(key) && server_client_assume_paste(s)) {
 		if (!(c->flags & CLIENT_READONLY))
 			window_pane_key(wp, c, s, key, m);
 		return;
diff --git a/server.c b/server.c
index 8664bd06..139505d4 100644
--- a/server.c
+++ b/server.c
@@ -177,6 +177,10 @@ server_start(struct event_base *base, int lockfd, char *lockfile)
 	}
 	close(pair[0]);
 
+	if (pledge("stdio rpath wpath cpath fattr unix recvfd proc exec tty "
+	    "ps", NULL) != 0)
+		fatal("pledge failed");
+
 	/*
 	 * Must daemonise before loading configuration as the PID changes so
 	 * $TMUX would be wrong for sessions created in the config file.
diff --git a/tmux.1 b/tmux.1
index 4fdb7f77..5d21caab 100644
--- a/tmux.1
+++ b/tmux.1
@@ -3411,6 +3411,7 @@ The following variables are available, where appropriate:
 .It Li "pid" Ta ""  Ta "Server PID"
 .It Li "scroll_region_lower" Ta "" Ta "Bottom of scroll region in pane"
 .It Li "scroll_region_upper" Ta "" Ta "Top of scroll region in pane"
+.It Li "scroll_position" Ta "" Ta "Scroll position in copy mode"
 .It Li "session_alerts" Ta "" Ta "List of window indexes with alerts"
 .It Li "session_attached" Ta "" Ta "Number of clients session is attached to"
 .It Li "session_activity" Ta "" Ta "Integer time of session last activity"
diff --git a/tmux.c b/tmux.c
index dff7952c..6e1de6f6 100644
--- a/tmux.c
+++ b/tmux.c
@@ -19,6 +19,7 @@
 #include <sys/types.h>
 #include <sys/stat.h>
 
+#include <err.h>
 #include <errno.h>
 #include <event.h>
 #include <fcntl.h>
@@ -260,6 +261,10 @@ main(int argc, char **argv)
 	if (shell_cmd != NULL && argc != 0)
 		usage();
 
+	if (pledge("stdio rpath wpath cpath flock fattr unix sendfd recvfd "
+	    "proc exec tty ps", NULL) != 0)
+		err(1, "pledge");
+
 	if (!(flags & CLIENT_UTF8)) {
 		/*
 		 * If the user has set whichever of LC_ALL, LC_CTYPE or LANG
diff --git a/tmux.h b/tmux.h
index 15d08611..001d2929 100644
--- a/tmux.h
+++ b/tmux.h
@@ -2083,6 +2083,7 @@ void printflike(2, 3) window_copy_add(struct window_pane *, const char *, ...);
 void		 window_copy_vadd(struct window_pane *, const char *, va_list);
 void		 window_copy_pageup(struct window_pane *);
 void		 window_copy_start_drag(struct client *, struct mouse_event *);
+int		 window_copy_scroll_position(struct window_pane *);
 
 /* window-choose.c */
 extern const struct window_mode window_choose_mode;
diff --git a/tty.c b/tty.c
index 7be952c8..3d6f29ca 100644
--- a/tty.c
+++ b/tty.c
@@ -228,7 +228,7 @@ tty_start_tty(struct tty *tty)
 	if (tty_term_has(tty->term, TTYC_KMOUS))
 		tty_puts(tty, "\033[?1000l\033[?1002l\033[?1006l\033[?1005l");
 
-	if (tty_term_has(tty->term, TTYC_XT)) {
+	if (tty_term_flag(tty->term, TTYC_XT)) {
 		if (options_get_number(&global_options, "focus-events")) {
 			tty->flags |= TTY_FOCUS;
 			tty_puts(tty, "\033[?1004h");
@@ -293,7 +293,7 @@ tty_stop_tty(struct tty *tty)
 	if (tty_term_has(tty->term, TTYC_KMOUS))
 		tty_raw(tty, "\033[?1000l\033[?1002l\033[?1006l\033[?1005l");
 
-	if (tty_term_has(tty->term, TTYC_XT)) {
+	if (tty_term_flag(tty->term, TTYC_XT)) {
 		if (tty->flags & TTY_FOCUS) {
 			tty->flags &= ~TTY_FOCUS;
 			tty_raw(tty, "\033[?1004l");
@@ -338,10 +338,8 @@ tty_free(struct tty *tty)
 	tty_close(tty);
 
 	free(tty->ccolour);
-	if (tty->path != NULL)
-		free(tty->path);
-	if (tty->termname != NULL)
-		free(tty->termname);
+	free(tty->path);
+	free(tty->termname);
 }
 
 void
@@ -1647,6 +1645,13 @@ tty_try_256(struct tty *tty, u_char colour, const char *type)
 {
 	char	s[32];
 
+	/*
+	 * If the user has specified -2 to the client, setaf and setab may not
+	 * work (or they may not want to use them), so send the usual sequence.
+	 */
+	if (tty->term_flags & TERM_256COLOURS)
+		goto fallback;
+
 	/*
 	 * If the terminfo entry has 256 colours and setaf and setab exist,
 	 * assume that they work correctly.
@@ -1664,13 +1669,6 @@ tty_try_256(struct tty *tty, u_char colour, const char *type)
 		return (0);
 	}
 
-	/*
-	 * If the user has specified -2 to the client, setaf and setab may not
-	 * work, so send the usual sequence.
-	 */
-	if (tty->term_flags & TERM_256COLOURS)
-		goto fallback;
-
 	return (-1);
 
 fallback:
diff --git a/window-copy.c b/window-copy.c
index c7d360de..f81a2a16 100644
--- a/window-copy.c
+++ b/window-copy.c
@@ -2219,6 +2219,16 @@ window_copy_scroll_down(struct window_pane *wp, u_int ny)
 	screen_write_stop(&ctx);
 }
 
+int
+window_copy_scroll_position(struct window_pane *wp)
+{
+	struct window_copy_mode_data	*data = wp->modedata;
+
+	if (wp->mode != &window_copy_mode)
+		return (-1);
+	return (data->oy);
+}
+
 void
 window_copy_rectangle_toggle(struct window_pane *wp)
 {