Hi,
When trying to use @ to mention users in a comments, this does not always populate correctly. For some characters like @c or @car this does not initiate a search request like below.
http://jira123/rest/api/2/user/viewissue/search?issueKey=PE-2030&projectKey=PE&maxResults=10&username=bt&_=1461071608463
This can be viewed through the network tab using chrome developer tools.
A workaround that we found was to click away from the comment block to remove focus, then back in again.
JIRA version (v7.0.5#70114-sha1:6afd55a)
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