dview_callback   3400 src/diffviewer/ydiff.c         dview = (WDiff *) find_widget_type (h, dview_callback);
dview_callback   3423 src/diffviewer/ydiff.c     dview = (const WDiff *) find_widget_type (h, dview_callback);
dview_callback   3457 src/diffviewer/ydiff.c     widget_init (w, dw->y, dw->x, dw->lines - 1, dw->cols, dview_callback, dview_mouse_callback);