Patch Set 3:

Fixes the untracked bug & rebased.

For the re-open compare view, CompareUtils.openInCompare looks like it would do the trick but that would need modifying the Command*Handler instances to use that method instead of CompareUI.openCompareEditor.

Need to;
* fix drag and drop (is there jgit support for unstage?)
* add context menu
* workspace file event tracking