Index: gtk2_ardour/editor_ops.cc
===================================================================
--- gtk2_ardour/editor_ops.cc   (revision 1073)
+++ gtk2_ardour/editor_ops.cc   (working copy)
@@ -1088,7 +1088,7 @@

        case ZoomFocusEdit:
                /* try to keep the edit cursor in the center */
-               if (edit_cursor->current_frame > leftmost_frame + (new_page/2)) {
+               if (edit_cursor->current_frame > new_page/2) {
                        leftmost_after_zoom = edit_cursor->current_frame - (new_page/2);
                } else {
                        leftmost_after_zoom = 0;