Add quoting mechanism directly from source files pages.

[kevung]

Hello Gitea community.

I would like to quote source file lines directly in issues (and outside any pull request mechanism), as it is possible to do so on Github:

Here is such an example:

Originally posted by @guillep2k in #7818 (comment)

For the moment, to do so on Gitea, one has to click on line numbers (on the left side of the source file content) and copy-paste the Url (http://mygiteaserver/user/myrepot/src/branch/master/examplefile.txt#LX where X is the number of the line to be reffered to) into the issue where the discussion takes place.

It would be very nice to be able to open a new issue directly by clicking on the line number as in Github.

Regards,

[stale]

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