Keep track of the targets which have already been notified of a matching
message, and do not notify them again if other patterns in the same
message match also. For example, consider the following match patterns:
1) <*watch> /msg *watch ADD *!*@* *highlight *%nick%*
2) <*watch> /msg *watch ADD *!*@* *highlight *testuser*
3) <*watch> /msg *watch ADD *!*@* *testhilights *test*
If %nick% ist something like "testuser123", all of the these patterns
match the following message:
<otheruser> hey testuser123, look at this: ...
Without this patch, the watch module would generate two notify messages
for target *highlight, and one notify message for target *testhilights.
This is unneccessary because patterns 1 and 2 will result in
generating the same notify message twice for target *highlight.
By using a std::set, the implementation in this patch keeps track of
which targets have already been notified and does not notify them more
than once.
Roland Hieber
84fae4ce97