auto-importing for packages doesn't keep track of existing packages

[dlsniper]

I'm yet to be very sure when this issue happens but I've find it quite a few times now when I find myself seeing 2 to 5 or more copies of the same package being added to the imports list automatically.

package main

import "log/syslog"

func main() {
    syslog.New(1, "a")
    syslog.LOG_ALERT
    sysl<caret> -> select syslog.NewWriter() from the suggestion list
}

Commit: 502f466

[dlsniper]

I've updated the description to reflect the way to reproduce the issue. Please let me know if it's clear on how to do it. Thank you.

[bronze1man]

It seems I had faced a issues that looks like this Monday.
Sorry,I can not reproduce it again.