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A browser's terminal-size control frame (NAWS through the console telnet server) can arrive while client_connected_hook is still creating the exec; the resize is a no-op then, and the tall default applied after creation would overwrite it, leaving the session at 511x10000 until the user resizes. Record sizes received before the exec exists and prefer them over the tall default once creation finishes. The recorded size is cleared when the last client disconnects, together with the restore-to-default.