Fixed false collision exception

[x2es]

for some reason webpack may call plugin several times for the same module - this is not collision

I propose to cache modulePath and skip exception if the same module appeared again.

[jgable]

I am also seeing multiple of the same modules come through my webpack pipeline. Also, the multiples have an empty string for module.request which makes their module.libIdent return a weird value.

I've actually fixed this by grabbing the sourcePath from module._source._name but that seems kinda sketchy.

[zhenyong]

@x2es Thanks.

This solution works for most case, but can not fix the problem like #2 .

[jampy]

@zhenyong

I don't think it's opposed to fix #2, but rather addresses a completely different issue.

The proposed solution looks flawless to me and IMHO there is no possibility for a regression. It rather seems like an important enhancement.

(that means that if you agree on the added value of this PR and even if it is not related to #2 you most probably will want to accept it - unless you see a concrete problem with it).

[zhenyong]

@jampy Thanks remind.

@x2es Since This branch has conflicts that must be resolved, do you mind I merge it via cli ? Or send a new PR ?

[zhenyong]

Merged

[x2es]

Thank you for merge!