Bug 541362 - [EcoreEditor] The DEL key deletes parent in table control

Add a focus listener to the generic editor's tree to only activate the
editor's keybinding context when the tree is focused.
With this, the delete no longer triggers when editing the detail view.

Change-Id: Ia010b66071ca104fe5e8249195179f340b6f9dde
Signed-off-by: Lucas Koehler <lkoehler@eclipsesource.com>
7 files changed