Select files after paste operation

[glangford]

Fix #573

[winstliu]

Hi @glangford, can you please add specs to this? Thanks!

[glangford]

Specs updated.

[glangford]

[glangford]

Additional commentary on Git status

Note that this PR also fixes the latent problem of git status being incorrectly shown on paste. The solution is included as part of selectOnCreate() at the moment. However, the proper fix is likely in files.coffee; note that in updateStatus(), the git status is retrieved from the cache. I have verified that pasted files will have no entry in the GitRepository cache, so a status of null is returned when they are initially constructed and displayed in the tree view.

Because the file status in cache is null, the parent directory status was also incorrect. (Repro in master by copying and pasting files into a directory, change focus to another app, then change focus back).

So an additional commit would be to change updateStatus for class File to include

status = repo.getCachedPathStatus(@path) ? repo.getPathStatus(@path)

rather than just

status = repo.getCachedPathStatus(@path)

Let me know if this sounds ok.

References

https://github.com/atom/tree-view/blob/master/lib/file.coffee#L55

https://github.com/atom/atom/blob/7d743827820969871e8724e6f353887a3ddfc105/src/git-repository.coffee#L338