helm-grep-do-git-grep not support match on selection?

[zw963]

Following is a example. please see screenshot.

I set mark and selection the region self.options, then run helm-grep-do-git-grep, what i expected is, search the selection part.
self.options, but in fact, only the symbol under the cursor get matched.

Thanks.

[zw963]

BTW: following is the same feature come from helm-git-grep, i use this feature for a long time.

https://github.com/yasuyk/helm-git-grep/blob/master/helm-git-grep.el#L695-L707

It support selection(if we have) or symbol under cursor.

Thanks