Description Martin Fleck 2017-04-26 05:49:29 EDT

When opening a comparison that does not have any differences or has all differences filtered from the editor, the toolbar still offers actions to merge diffs and to navigate between diffs:
- Copy current change from left to right
- Copy current change from right to left
- Apply all left changes on the right-hand side
- Apply all left changes on the left-hand side
- Next difference
- Previous difference

Copying single changes and navigating diffs result in NPEs and applying all changes simply does nothing.

Instead, these actions should be disabled to communicate to the user that they are not available at the time.

Similarly, the copy current change actions should be disabled when no current change is selected.