This interface must be provided by Show In targets (parts listed
in the Show In prompter).
The part can either directly implement this interface, or provide it
via IAdaptable.getAdapter(IShowInTarget.class).
Shows the given context in this target.
The target should check the context's selection for elements
to show. If there are no relevant elements in the selection,
then it should check the context's input.
Parameters:
context - the context to show
Returns:
true if the context could be shown,
false otherwise