When using previewOnly or FlushOnly for populate,

p4-plugin uses "p4 counter changes" and grabs the latest change number on the server.  This may not reflect what changelist actually syncd on the client.

What p4-plugin does:

p4 counter change
p4 changes -m1 -ssubmitted //jenkins_test2_453/...@55287791

Instead it should use :

p4 changes -m1 -ssubmitted //jenkins_test2_453/...#have 

To acquire the