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	Instead of every command resolving the target (-t or -s) itself, prepare
the state (client, session, winlink, pane) for it it before entering the command. Each command provides some flags that tell the prepare step what it is expecting. This is a requirement for having hooks on commands (for example, if you hook "select-window -t1:2", the hook command should to operate on window 1:2 not whatever it thinks is the current window), and should allow some other target improvements. The old cmd_find_* functions remain for the moment but that layer will be dropped later. Joint work with Thomas Adam.
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		@@ -49,7 +49,7 @@ const struct cmd_entry cmd_list_windows_entry = {
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	"list-windows", "lsw",
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	"F:at:", 0, 0,
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	"[-a] [-F format] " CMD_TARGET_SESSION_USAGE,
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	0,
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	CMD_SESSION_T,
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	cmd_list_windows_exec
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};
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@@ -57,16 +57,11 @@ enum cmd_retval
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cmd_list_windows_exec(struct cmd *self, struct cmd_q *cmdq)
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{
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	struct args	*args = self->args;
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	struct session	*s;
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	if (args_has(args, 'a'))
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		cmd_list_windows_server(self, cmdq);
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	else {
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		s = cmd_find_session(cmdq, args_get(args, 't'), 0);
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		if (s == NULL)
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			return (CMD_RETURN_ERROR);
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		cmd_list_windows_session(self, s, cmdq, 0);
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	}
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	else
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		cmd_list_windows_session(self, cmdq->state.tflag.s, cmdq, 0);
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	return (CMD_RETURN_NORMAL);
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}
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