Implement "all event" (1003) mouse mode but in a way that works. The

main issue is that if we have two panes, A with 1002 and B with 1003, we
need to set 1003 outside tmux in order to get all the mouse events, but
then we need to suppress the ones that pane A doesn't want. This is easy
in SGR mouse mode, because buttons == 3 is only used for movement events
(for other events the trailing m/M marks a release instead), but in
normal mouse mode we can't tell so easily. So for that, look at the
previous event instead - if it is drag+release as well, then the current
event is a movement event.

format.c

@@ -1280,11 +1280,13 @@ format_defaults_pane(struct format_tree *ft, struct window_pane *wp)
 	    !!(wp->base.mode & MODE_WRAP));
 
 	format_add(ft, "mouse_any_flag", "%d",
-	    !!(wp->base.mode & (MODE_MOUSE_STANDARD|MODE_MOUSE_BUTTON)));
+	    !!(wp->base.mode & ALL_MOUSE_MODES));
 	format_add(ft, "mouse_standard_flag", "%d",
 	    !!(wp->base.mode & MODE_MOUSE_STANDARD));
 	format_add(ft, "mouse_button_flag", "%d",
 	    !!(wp->base.mode & MODE_MOUSE_BUTTON));
+	format_add(ft, "mouse_all_flag", "%d",
+	    !!(wp->base.mode & MODE_MOUSE_ALL));
 
 	format_add_cb(ft, "pane_tabs", format_cb_pane_tabs);
 }

input-keys.c

@@ -235,20 +235,42 @@ input_key(struct window_pane *wp, key_code key, struct mouse_event *m)
 static void
 input_key_mouse(struct window_pane *wp, struct mouse_event *m)
 {
-	char	buf[40];
-	size_t	len;
-	u_int	x, y;
+	struct screen	*s = wp->screen;
+	int		 mode = s->mode;
+	char		 buf[40];
+	size_t		 len;
+	u_int		 x, y;
 
-	if ((wp->screen->mode & ALL_MOUSE_MODES) == 0)
+	if ((mode & ALL_MOUSE_MODES) == 0)
 		return;
 	if (!window_pane_visible(wp))
 		return;
 	if (cmd_mouse_at(wp, m, &x, &y, 0) != 0)
 		return;
 
-	/* If this pane is not in button mode, discard motion events. */
-	if (!(wp->screen->mode & MODE_MOUSE_BUTTON) && (m->b & MOUSE_MASK_DRAG))
-		return;
+	/* If this pane is not in button or all mode, discard motion events. */
+	if (MOUSE_DRAG(m->b) &&
+	    (mode & (MODE_MOUSE_BUTTON|MODE_MOUSE_ALL)) == 0)
+	    return;
+
+	/*
+	 * If this event is a release event and not in all mode, discard it.
+	 * In SGR mode we can tell absolutely because a release is normally
+	 * shown by the last character. Without SGR, we check if the last
+	 * buttons was also a release.
+	 */
+	if (m->sgr_type != ' ') {
+		if (MOUSE_DRAG(m->sgr_b) &&
+		    MOUSE_BUTTONS(m->sgr_b) == 3 &&
+		    (~mode & MODE_MOUSE_ALL))
+			return;
+	} else {
+		if (MOUSE_DRAG(m->b) &&
+		    MOUSE_BUTTONS(m->b) == 3 &&
+		    MOUSE_BUTTONS(m->lb) == 3 &&
+		    (~mode & MODE_MOUSE_ALL))
+			return;
+	}
 
 	/*
 	 * Use the SGR (1006) extension only if the application requested it
@@ -259,10 +281,10 @@ input_key_mouse(struct window_pane *wp, struct mouse_event *m)
 	 * UTF-8 (1005) extension if the application requested, or to the
 	 * legacy format.
 	 */
-	if (m->sgr_type != ' ' && (wp->screen->mode & MODE_MOUSE_SGR)) {
+	if (m->sgr_type != ' ' && (s->mode & MODE_MOUSE_SGR)) {
 		len = xsnprintf(buf, sizeof buf, "\033[<%u;%u;%u%c",
 		    m->sgr_b, x + 1, y + 1, m->sgr_type);
-	} else if (wp->screen->mode & MODE_MOUSE_UTF8) {
+	} else if (s->mode & MODE_MOUSE_UTF8) {
 		if (m->b > 0x7ff - 32 || x > 0x7ff - 33 || y > 0x7ff - 33)
 			return;
 		len = xsnprintf(buf, sizeof buf, "\033[M");

input.c

@@ -1477,6 +1477,7 @@ input_csi_dispatch_rm_private(struct input_ctx *ictx)
 		case 1000:
 		case 1001:
 		case 1002:
+		case 1003:
 			screen_write_mode_clear(&ictx->ctx, ALL_MOUSE_MODES);
 			break;
 		case 1004:
@@ -1560,6 +1561,10 @@ input_csi_dispatch_sm_private(struct input_ctx *ictx)
 			screen_write_mode_clear(&ictx->ctx, ALL_MOUSE_MODES);
 			screen_write_mode_set(&ictx->ctx, MODE_MOUSE_BUTTON);
 			break;
+		case 1003:
+			screen_write_mode_clear(&ictx->ctx, ALL_MOUSE_MODES);
+			screen_write_mode_set(&ictx->ctx, MODE_MOUSE_ALL);
+			break;
 		case 1004:
 			if (ictx->ctx.s->mode & MODE_FOCUSON)
 				break;

key-string.c

@@ -255,6 +255,12 @@ key_string_lookup_key(key_code key)
 		return ("Mouse");
 	if (key == KEYC_DRAGGING)
 		return ("Dragging");
+	if (key == KEYC_MOUSEMOVE_PANE)
+		return ("MouseMovePane");
+	if (key == KEYC_MOUSEMOVE_STATUS)
+		return ("MouseMoveStatus");
+	if (key == KEYC_MOUSEMOVE_BORDER)
+		return ("MouseMoveBorder");
 
 	/*
 	 * Special case: display C-@ as C-Space. Could do this below in

server-client.c

@@ -335,14 +335,27 @@ server_client_check_mouse(struct client *c)
 	int			 flag;
 	key_code		 key;
 	struct timeval		 tv;
-	enum { NOTYPE, DOWN, UP, DRAG, WHEEL, DOUBLE, TRIPLE } type = NOTYPE;
-	enum { NOWHERE, PANE, STATUS, BORDER } where = NOWHERE;
+	enum { NOTYPE, MOVE, DOWN, UP, DRAG, WHEEL, DOUBLE, TRIPLE } type;
+	enum { NOWHERE, PANE, STATUS, BORDER } where;
+
+	type = NOTYPE;
+	where = NOWHERE;
 
 	log_debug("mouse %02x at %u,%u (last %u,%u) (%d)", m->b, m->x, m->y,
 	    m->lx, m->ly, c->tty.mouse_drag_flag);
 
 	/* What type of event is this? */
-	if (MOUSE_DRAG(m->b)) {
+	if ((m->sgr_type != ' ' &&
+	    MOUSE_DRAG(m->sgr_b) &&
+	    MOUSE_BUTTONS(m->sgr_b) == 3) ||
+	    (m->sgr_type == ' ' &&
+	    MOUSE_DRAG(m->b) &&
+	    MOUSE_BUTTONS(m->b) == 3 &&
+	    MOUSE_BUTTONS(m->lb) == 3)) {
+		type = MOVE;
+		x = m->x, y = m->y, b = 0;
+		log_debug("move at %u,%u", x, y);
+	} else if (MOUSE_DRAG(m->b)) {
 		type = DRAG;
 		if (c->tty.mouse_drag_flag) {
 			x = m->x, y = m->y, b = m->b;
@@ -500,6 +513,14 @@ have_event:
 	switch (type) {
 	case NOTYPE:
 		break;
+	case MOVE:
+		if (where == PANE)
+			key = KEYC_MOUSEMOVE_PANE;
+		if (where == STATUS)
+			key = KEYC_MOUSEMOVE_STATUS;
+		if (where == BORDER)
+			key = KEYC_MOUSEMOVE_BORDER;
+		break;
 	case DRAG:
 		if (c->tty.mouse_drag_update != NULL)
 			key = KEYC_DRAGGING;
@@ -1055,7 +1076,7 @@ static void
 server_client_reset_state(struct client *c)
 {
 	struct window		*w = c->session->curw->window;
-	struct window_pane	*wp = w->active;
+	struct window_pane	*wp = w->active, *loop;
 	struct screen		*s = wp->screen;
 	struct options		*oo = c->session->options;
 	int			 status, mode, o;
@@ -1079,8 +1100,15 @@ server_client_reset_state(struct client *c)
 	 * mode.
 	 */
 	mode = s->mode;
-	if (options_get_number(oo, "mouse"))
-		mode = (mode & ~ALL_MOUSE_MODES) | MODE_MOUSE_BUTTON;
+	if (options_get_number(oo, "mouse")) {
+		mode &= ~ALL_MOUSE_MODES;
+		TAILQ_FOREACH(loop, &w->panes, entry) {
+			if (loop->screen->mode & MODE_MOUSE_ALL)
+				mode |= MODE_MOUSE_ALL;
+		}
+		if (~mode & MODE_MOUSE_ALL)
+			mode |= MODE_MOUSE_BUTTON;
+	}
 
 	/* Set the terminal mode and reset attributes. */
 	tty_update_mode(&c->tty, mode, s);

tmux.1

@@ -3528,6 +3528,7 @@ The following variables are available, where appropriate:
 .It Li "mouse_any_flag" Ta "" Ta "Pane mouse any flag"
 .It Li "mouse_button_flag" Ta "" Ta "Pane mouse button flag"
 .It Li "mouse_standard_flag" Ta "" Ta "Pane mouse standard flag"
+.It Li "mouse_all_flag" Ta "" Ta "Pane mouse all flag"
 .It Li "pane_active" Ta "" Ta "1 if active pane"
 .It Li "pane_bottom" Ta "" Ta "Bottom of pane"
 .It Li "pane_current_command" Ta "" Ta "Current command if available"

tmux.h

@@ -137,6 +137,7 @@ enum {
 	/* Mouse keys. */
 	KEYC_MOUSE, /* unclassified mouse event */
 	KEYC_DRAGGING, /* dragging in progress */
+	KEYC_MOUSE_KEY(MOUSEMOVE),
 	KEYC_MOUSE_KEY(MOUSEDOWN1),
 	KEYC_MOUSE_KEY(MOUSEDOWN2),
 	KEYC_MOUSE_KEY(MOUSEDOWN3),
@@ -488,8 +489,9 @@ struct msg_stderr_data {
 #define MODE_MOUSE_SGR 0x200
 #define MODE_BRACKETPASTE 0x400
 #define MODE_FOCUSON 0x800
+#define MODE_MOUSE_ALL 0x1000
 
-#define ALL_MOUSE_MODES (MODE_MOUSE_STANDARD|MODE_MOUSE_BUTTON)
+#define ALL_MOUSE_MODES (MODE_MOUSE_STANDARD|MODE_MOUSE_BUTTON|MODE_MOUSE_ALL)
 
 /*
  * A single UTF-8 character. UTF8_SIZE must be big enough to hold at least one

tty.c

@@ -568,12 +568,16 @@ tty_update_mode(struct tty *tty, int mode, struct screen *s)
 			 * it is safe from misinterpretation.
 			 */
 			tty_puts(tty, "\033[?1006h");
-			if (mode & MODE_MOUSE_BUTTON)
+			if (mode & MODE_MOUSE_ALL)
+				tty_puts(tty, "\033[?1003h");
+			else if (mode & MODE_MOUSE_BUTTON)
 				tty_puts(tty, "\033[?1002h");
 			else if (mode & MODE_MOUSE_STANDARD)
 				tty_puts(tty, "\033[?1000h");
 		} else {
-			if (tty->mode & MODE_MOUSE_BUTTON)
+			if (tty->mode & MODE_MOUSE_ALL)
+				tty_puts(tty, "\033[?1003l");
+			else if (tty->mode & MODE_MOUSE_BUTTON)
 				tty_puts(tty, "\033[?1002l");
 			else if (tty->mode & MODE_MOUSE_STANDARD)
 				tty_puts(tty, "\033[?1000l");