- The FindReplaceOverlay's setTextEditorActionsActivated method
reflectively invokes AbstractTextEditor.setActionActivation(boolean) and
that method assumes that getEditorSite().getActionBarContributor()
returns non-null but MultiPageEditorSite.getActionBarContributor()
returns null so in PDE's target editor, this leads to an NPE.
- AbstractTextEditor.setActionActivation(boolean) must guard against a
null action contributor to avoid NPE and instead should get and use the
action bar contributor of the containing multi-page editor.