tree 0e56aa631aa60afd9c1f6a56a3c0dd1cfea80db8
parent 52c403c9e752528f8af3793e19f5d6d198748f38
author Dominique Blouin <dominique.blouin@laposte.net> 1572972160 +0100
committer Jan-Philipp Steghöfer <ec@splashstudio.com> 1583532282 +0100

Added extension point to support for unpacking selections from parts.

This change is made so that elements Capra can create traces to can be
extracted from ISelection instances that contain complex objects. Via
the new ISelectionSupport interface and the corresponding extension
points, plugins can register their own SelectionSupport clases that
take over the unwrapping.
SelectionSupportHelper will take over the functionality that has so
far been a part of TraceCreationHelper.

One example of this is the upcoming handler for Xtext. Xtext workbench
parts such as the Xtext editor and the outline part use selections that
contain instances of specialised Xtext classes. This means that  the
Xtext API must be used to extract the elements from the selection. In
order to avoid introducing dependencies to the Xtext framework into
the core Capra, an extension of the selection support extension point
will be used.

Signed-off-by: Dominique Blouin <dominique.blouin@laposte.net>
Change-Id: Iba72d37918474b7a6e0a0f1273a198de6fe2eaae