/// Push an item on to the stack, deleting the bottom group on
/// overflow.
void push(UndoElement const & v) {
- c_.push_front(v);
- if (c_.size() > limit_) {
+ // Remove some entries if the limit has been reached.
+ // However, if the only group on the stack is the one
+ // we are currently populating, do nothing.
+ if (c_.size() >= limit_
+ && c_.front().group_id != v.group_id) {
// remove a whole group at once.
const size_t gid = c_.back().group_id;
while (!c_.empty() && c_.back().group_id == gid)
c_.pop_back();
}
+ c_.push_front(v);
}
/// Mark all the elements of the stack as dirty