// {{{ add() method
public void add(UndoManager mgr, Edit edit) {
_add(edit);
// try to compact a sequence of Remove and Insert into a Replace
// Edit to save memory for large search&replace operations
if (last.prev != null) {
Edit rep = mgr.getReplaceFromRemoveInsert(last.prev, last);
if (rep != null) exchangeLastElement(rep);
}
// try to compress a sequence of Replace and Replace into a "CompressedReplace"
if (last.prev != null) {
Edit rep = mgr.getCompressedReplaceFromReplaceReplace(last.prev, last);
if (rep != null) exchangeLastElement(rep);
}
// try to compress a sequence of CompressedReplace and Replace into a "CompressedReplace"
if (last.prev != null) {
Edit rep = mgr.getCompressedReplaceFromReplaceReplace(last.prev, last);
if (rep != null) exchangeLastElement(rep);
}
} // }}}