Enable the text editor toolbar items for DiffEditorPage
A TextEditor provides a couple of items in an action set in the global
Eclipse toolbar: buttons for block selection, word wrap, showing
whitespace, and navigation between annotations. As the DiffEditorPage
is a real TextEditor now, enable those.
* Add an "action set part association" in plugin.xml to get those
buttons at all when the CommitEditor is active.
* Propagate the global action contributions from the nested editor's
SubActionBars to those of the CommitEditor.
Change-Id: I516b5609906aefb6840bc9f4f4e95d92fafc1590
Signed-off-by: Thomas Wolf <thomas.wolf@paranor.ch>