Clean IO before closing a view or quitting

Make sure that a command still running in a view is properly terminated
when the view is closed. This is mostly visible in the pager view. That
should pretty much make #828 redundant.

Author: koutcher

src/tig.c

@@ -324,6 +324,7 @@ view_driver(struct view *view, enum request request)
 		 * view itself. Parents to closed view should never be
 		 * followed. */
 		if (view->prev && view->prev != view) {
+			end_update(view, true);
 			maximize_view(view->prev, true);
 			view->prev = view;
 			break;
@@ -334,6 +335,8 @@ view_driver(struct view *view, enum request request)
 		}
 		/* Fall-through */
 	case REQ_QUIT:
+		foreach_view(view, i)
+			end_update(view, true);
 		return false;
 
 	default: