Re: Assertion failure in xdisp.c

[Richard Stallman]

              if (!row->enabled_p || !MATRIX_ROW_DISPLAYS_TEXT_P (row))
                abort ();

    On my Mac OS X machine, catching this abort in the debugger leads to
    a confusing stack trace (GDB tells me I'm in try_window_id called from
    try_window_id, and doesn't mention find_first_unchanged_at_end_row).

This is a bug in GDB.  If you are using GDB as distributed by Apple,
I suggest you report it to them.