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	Make command exec functions return an enum rather than -1/0/1 values and
add a new value to mean "leave client running but don't attach" to fix problems with using some commands in a command sequence. Most of the work by Thomas Adam, problem reported by "jspenguin" on SF bug 3535531.
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		@@ -27,7 +27,7 @@
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 * List panes on given window.
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 */
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int	cmd_list_panes_exec(struct cmd *, struct cmd_ctx *);
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enum cmd_retval	 cmd_list_panes_exec(struct cmd *, struct cmd_ctx *);
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void	cmd_list_panes_server(struct cmd *, struct cmd_ctx *);
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void	cmd_list_panes_session(
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@@ -45,7 +45,7 @@ const struct cmd_entry cmd_list_panes_entry = {
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	cmd_list_panes_exec
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};
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int
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enum cmd_retval
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cmd_list_panes_exec(struct cmd *self, struct cmd_ctx *ctx)
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{
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	struct args	*args = self->args;
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@@ -57,16 +57,16 @@ cmd_list_panes_exec(struct cmd *self, struct cmd_ctx *ctx)
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	else if (args_has(args, 's')) {
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		s = cmd_find_session(ctx, args_get(args, 't'), 0);
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		if (s == NULL)
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			return (-1);
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			return (CMD_RETURN_ERROR);
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		cmd_list_panes_session(self, s, ctx, 1);
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	} else {
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		wl = cmd_find_window(ctx, args_get(args, 't'), &s);
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		if (wl == NULL)
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			return (-1);
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			return (CMD_RETURN_ERROR);
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		cmd_list_panes_window(self, s, wl, ctx, 0);
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	}
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	return (0);
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	return (CMD_RETURN_NORMAL);
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}
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void
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