DMSF support: add id to image label

[tofi86]

From @dinya at #64 (comment):

@tofi86

Could you add dmsf file ID to image label (something like [<id>] <title>)?

Use case. I found the image of interest in the slide preview and wanna link to it in some issue or wiki page with {{dmsftn(id)}}.

Currently I should remember the title (label), close preview and find ID by title in the files list. And then I can add the link. But the ID presence in the label in the bottom prevents this three unnecessary steps (remember, close and find).

What do you think?

[tofi86]

Support added for both Redmine 4 (branch master) and Redmine 3.4 (branch redmine-3.4).

[dinya]

@tofi86

I updated with the current redmine-3.4 branch, but there is no ID in the image label (DMS tab),

Label with dmsf id is ok in the issue page (like on your screenshot above).

My env:

Item	Version
Redmine version	3.4.11.stable
Ruby version	2.3.3-p222 (2016-11-21) [x86_64-linux]
redmine_lightbox2	0.4.5
redmine_dmsf	1.6.2

[tofi86]

Did you run the plugin migrations?

[dinya]

Yes, as usual with

bundle exec rake redmine:plugins:migrate RAILS_ENV="production"

[tofi86]

Now I get it. it works in issues but not in DMS tab. sorry.

I added #74 for that.