Make two -E only close popup automatically if the command exited with 0.

popup.c

@@ -260,7 +260,8 @@ popup_key_cb(struct client *c, struct key_event *event)
 	if (pd->ictx != NULL && (pd->flags & POPUP_WRITEKEYS)) {
 		if (KEYC_IS_MOUSE(event->key))
 			return (0);
-		if ((~pd->flags & POPUP_CLOSEEXIT) &&
+		if (((pd->flags & (POPUP_CLOSEEXIT|POPUP_CLOSEEXITZERO)) == 0 ||
+		    pd->job == NULL) &&
 		    (event->key == '\033' || event->key == '\003'))
 			return (1);
 		if (pd->job == NULL)
@@ -347,6 +348,8 @@ popup_job_complete_cb(struct job *job)
 
 	if (pd->flags & POPUP_CLOSEEXIT)
 		server_client_clear_overlay(pd->c);
+	if ((pd->flags & POPUP_CLOSEEXITZERO) && pd->status == 0)
+		server_client_clear_overlay(pd->c);
 }
 
 u_int

tmux.1

@@ -5032,6 +5032,11 @@ shell command.
 closes the popup automatically when
 .Ar shell-command
 exits.
+Two
+.Fl E
+closes the popup only if
+.Ar shell-command
+exited with success.
 With
 .Fl K ,
 .Ql Escape

tmux.h

@@ -2761,6 +2761,7 @@ int		 menu_display(struct menu *, int, struct cmdq_item *, u_int,
 /* popup.c */
 #define POPUP_WRITEKEYS 0x1
 #define POPUP_CLOSEEXIT 0x2
+#define POPUP_CLOSEEXITZERO 0x4
 u_int		 popup_width(struct cmdq_item *, u_int, const char **,
 		    struct client *, struct cmd_find_state *);
 u_int		 popup_height(u_int, const char **);