#PHP, 1192 bytes:
<?=
'<pre>'.
(function ($compressed) {
preg_match_all("#(^.+?)\n(.+$)#us", $compressed, $matches, PREG_SET_ORDER);
list($schema, $compressed) = [ $matches[0][1] , $matches[0][2] ];
for ($ix = strlen($schema) - 1; $ix >= 0; $ix--) {
$char = $schema[$ix];
$charQuoted = preg_quote($char, '#');
preg_match_all("#{$charQuoted}(.+?){$charQuoted}#mus", $compressed, $matches1, PREG_SET_ORDER);
$fullQuoted = preg_quote($matches1[0][0], '#');
$compressed = preg_replace("#{$fullQuoted}#mus", $matches1[0][1], $compressed);
$compressed = str_replace($char, $matches1[0][1], $compressed);
}
return $compressed;
})(
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).'</pre>';
?>