4. Considering the following situation,
1. Mr.A own "user123" at,
* testwiki,meta,common,mediawiki: 100,500,500,500 edits count
* enwikipedia,enwikibooks,enwikitionary,enwikisource,enwikinews:
100,100,100,100,100 edits count
* lowikipedia,lowikibooks,lowiktionary,lowikisource,lowikinews:
500,100,100,100,100 edits count
* totally, Mr.A has 3000 edits count
2. Mr.B own "user123" only at frwikipedia with 2000 edits count
3. When Mr.A use user123 on lowikipedia, and do
http://lowikipedia/Special:MergeAccount, what will be the homewiki of
user123?
4. Mr.A can successfully merge account?
5. If homewiki determined by the system is user123@frwikipedia,
then what thing Mr.A could do to get his accounts merged?
The best idea is for Mr.A and Mr.B to have a friendly chat with each other
about who they think should get the global account. Then, depending on the
results of that conversation, either Mr.A can rename his many accounts to
some new, unique username; or Mr.B can rename his fr.wikipedia account and
Mr.A can get the global name.