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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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		@@ -37,7 +37,7 @@ const struct cmd_entry cmd_paste_buffer_entry = {
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	"paste-buffer", "pasteb",
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	"db:prs:t:", 0, 0,
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	"[-dpr] [-s separator] " CMD_BUFFER_USAGE " " CMD_TARGET_PANE_USAGE,
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	0,
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	CMD_PANE_T,
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	cmd_paste_buffer_exec
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};
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@@ -45,16 +45,12 @@ enum cmd_retval
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cmd_paste_buffer_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 window_pane	*wp;
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	struct session		*s;
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	struct window_pane	*wp = cmdq->state.tflag.wp;
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	struct paste_buffer	*pb;
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	const char		*sepstr, *bufname, *bufdata, *bufend, *line;
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	size_t			 seplen, bufsize;
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	int			 bracket = args_has(args, 'p');
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	if (cmd_find_pane(cmdq, args_get(args, 't'), &s, &wp) == NULL)
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		return (CMD_RETURN_ERROR);
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	bufname = NULL;
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	if (args_has(args, 'b'))
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		bufname = args_get(args, 'b');
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