Store pane ID for mouse last pane instead of a pointer to the pane.

cmd-resize-pane.c

@@ -78,13 +78,14 @@ cmd_resize_pane_exec(struct cmd *self, struct cmdq_item *item)
 	}
 
 	if (args_has(args, 'M')) {
-		if (!event->m.valid || cmd_mouse_window(&event->m, &s) == NULL)
+		if (!event->m.valid)
 			return (CMD_RETURN_NORMAL);
-		if (c == NULL || c->session != s)
+		wp = cmd_mouse_pane(&event->m, &s, NULL);
+		if (wp == NULL || c == NULL || c->session != s)
 			return (CMD_RETURN_NORMAL);
-		if (c->tty.mouse_wp->flags & PANE_FLOATING) {
+		if (wp->flags & PANE_FLOATING) {
-			window_redraw_active_switch(w, c->tty.mouse_wp);
+			window_redraw_active_switch(w, wp);
-			window_set_active_pane(w, c->tty.mouse_wp, 1);
+			window_set_active_pane(w, wp, 1);
 			c->tty.mouse_drag_update = cmd_resize_pane_mouse_update_floating;
 			cmd_resize_pane_mouse_update_floating(c, &event->m);
 		} else {
@@ -168,12 +169,13 @@ cmd_resize_pane_mouse_update_floating(struct client *c, struct mouse_event *m)
 	int			 new_sx, new_sy;
 	int			 new_xoff, new_yoff, resizes = 0;
 
-	wl = cmd_mouse_window(m, NULL);
+	wp = cmd_mouse_pane(m, NULL, &wl);
-	if (wl == NULL) {
+	if (wp == NULL) {
 		c->tty.mouse_drag_update = NULL;
 		return;
 	}
 	w = wl->window;
+	lc = wp->layout_cell;
 
 	y = m->y + m->oy; x = m->x + m->ox;
 	if (m->statusat == 0 && y >= m->statuslines)
@@ -186,9 +188,6 @@ cmd_resize_pane_mouse_update_floating(struct client *c, struct mouse_event *m)
 	else if (m->statusat > 0 && ly >= (u_int)m->statusat)
 		ly = m->statusat - 1;
 
-	wp = c->tty.mouse_wp;
-	lc = wp->layout_cell;
-
 	log_debug("%s: %%%u resize_pane xoff=%d sx=%u xy=%ux%u lxy=%ux%u",
 	    __func__, wp->id, wp->xoff, wp->sx, x, y, lx, ly);
 	if ((((int)lx == wp->xoff - 1) || ((int)lx == wp->xoff)) &&

server-client.c

@@ -718,7 +718,7 @@ server_client_check_mouse(struct client *c, struct key_event *event)
 	struct session			*s = c->session, *fs;
 	struct window			*w = s->curw->window;
 	struct winlink			*fwl;
-	struct window_pane		*wp, *fwp;
+	struct window_pane		*wp, *fwp, *lwp = NULL;
 	u_int				 x, y, sx, sy, px, py, n, sl_mpos = 0;
 	u_int				 b, bn;
 	int				 ignore = 0;
@@ -731,6 +731,13 @@ server_client_check_mouse(struct client *c, struct key_event *event)
 	log_debug("%s mouse %02x at %u,%u (last %u,%u) (%d)", c->name, m->b,
 	    m->x, m->y, m->lx, m->ly, c->tty.mouse_drag_flag);
 
+	/* Find last pane, if any. */
+	if (c->tty.mouse_last_pane != -1) {
+		lwp = window_pane_find_by_id(c->tty.mouse_last_pane);
+		if (lwp != NULL)
+			log_debug("%s mouse last pane %%%u", c->name, lwp->id);
+	}
+
 	/* What type of event is this? */
 	if (event->key == KEYC_DOUBLECLICK) {
 		type = KEYC_TYPE_DOUBLECLICK;
@@ -875,9 +882,11 @@ have_event:
 	 */
 	if (loc == KEYC_MOUSE_LOCATION_NOWHERE) {
 		if (c->tty.mouse_scrolling_flag) {
-			loc = KEYC_MOUSE_LOCATION_SCROLLBAR_SLIDER;
+			if (lwp != NULL) {
-			m->wp = c->tty.mouse_wp->id;
+				loc = KEYC_MOUSE_LOCATION_SCROLLBAR_SLIDER;
-			m->w = c->tty.mouse_wp->window->id;
+				m->wp = lwp->id;
+				m->w = lwp->window->id;
+			}
 		} else {
 			px = x;
 			if (m->statusat == 0 && y >= m->statuslines)
@@ -895,13 +904,13 @@ have_event:
 			px = px + m->ox;
 			py = py + m->oy;
 
-			if (type == KEYC_TYPE_MOUSEDRAG &&
+			if (type == KEYC_TYPE_MOUSEDRAG && lwp != NULL) {
-			    c->tty.mouse_wp != NULL)
 				/* Use pane from last mouse event. */
-				wp = c->tty.mouse_wp;
+				wp = lwp;
-			else
+			} else {
 				/* Try inside the pane. */
 				wp = window_get_active_at(w, px, py);
+			}
 			if (wp == NULL)
 				return (KEYC_UNKNOWN);
 			loc = server_client_check_mouse_in_pane(wp, px, py,
@@ -979,8 +988,8 @@ have_event:
 		 */
 		type = KEYC_TYPE_MOUSEDRAGEND;
 		c->tty.mouse_drag_flag = 0;
-		c->tty.mouse_wp = NULL;
 		c->tty.mouse_slider_mpos = -1;
+        c->tty.mouse_last_pane = -1;
 	}
 
 	/* Convert to a key binding. */
@@ -1006,10 +1015,11 @@ have_event:
 		 * where the user grabbed.
 		 */
 		c->tty.mouse_drag_flag = MOUSE_BUTTONS(b) + 1;
+
 		/* Only change pane if not already dragging a pane border. */
-		if (c->tty.mouse_wp == NULL) {
+		if (lwp == NULL) {
-			wp = window_get_active_at(w, px, py);
+			lwp = wp = window_get_active_at(w, px, py);
-			c->tty.mouse_wp = wp;
+			c->tty.mouse_last_pane = wp->id;
 		}
 		if (c->tty.mouse_scrolling_flag == 0 &&
 		    loc == KEYC_MOUSE_LOCATION_SCROLLBAR_SLIDER) {
@@ -2820,8 +2830,8 @@ server_client_remove_pane(struct window_pane *wp)
 			RB_REMOVE(client_windows, &c->windows, cw);
 			free(cw);
 		}
-		if (c->tty.mouse_wp == wp) {
+		if (c->tty.mouse_last_pane == (int)wp->id) {
-			c->tty.mouse_wp = NULL;
+			c->tty.mouse_last_pane = -1;
 			c->tty.mouse_drag_update = NULL;
 			c->tty.mouse_scrolling_flag = 0;
 		}

tmux.h

@@ -1719,7 +1719,7 @@ struct tty {
 	int		 mouse_drag_flag;
 	int		 mouse_scrolling_flag;
 	int		 mouse_slider_mpos;
-	struct window_pane *mouse_wp;
+	int		 mouse_last_pane;
 	void		(*mouse_drag_update)(struct client *,
 			    struct mouse_event *);
 	void		(*mouse_drag_release)(struct client *,

tty.c

@@ -108,6 +108,7 @@ tty_init(struct tty *tty, struct client *c)
 	tty->cstyle = SCREEN_CURSOR_DEFAULT;
 	tty->ccolour = -1;
 	tty->fg = tty->bg = -1;
+	tty->mouse_last_pane = -1;
 
 	if (tcgetattr(c->fd, &tty->tio) != 0)
 		return (-1);

window-copy.c

@@ -6507,10 +6507,7 @@ window_copy_drag_update(struct client *c, struct mouse_event *m)
 	if (c == NULL)
 		return;
 
-	if (c->tty.mouse_wp != NULL)
+	wp = cmd_mouse_pane(m, NULL, NULL);
-		wp = c->tty.mouse_wp;
-	else
-		wp = cmd_mouse_pane(m, NULL, NULL);
 	if (wp == NULL)
 		return;
 	wme = TAILQ_FIRST(&wp->modes);