Dub add not as ergnomic as old copy-paste way

[dkorpel]

So apparently #391 has been merged a while ago, but I recently noticed I miss the simple dub.json / dub.sdl copy-paste boxes. I simply wanted to quickly add a d-graphviz dependency for buildType "unittest". I thought I could easily use dub add and move the dependency manually inside my buildType, but it completely rewrote my dub.sdl removing comments and re-ordering buildOptions etc.

I'm not sure whether I want the old copy-paste boxes back, but at least the new dub add method should be as ergonomic as the old way. Doing dub add + find and copy the line + undo + paste in right place is a lot more clumsy than copy the line + paste in the right place.

[dkorpel]

I just realized that the dub add thing is really a dub issue and not an issue in the registry, but I encountered this as a regression in the registry so I'm interested in hearing what other people think about this before moving the issue there.

[andre2007]

@dkorpel please see also the pr discussion: https://github.com/dlang/dub/pull/1587