Notes from the backtrace: The crash is due to a call to abort() at
xdisp.c:12026 (which emacs then catches and rethrows, in
fatal_error_signal() in emacs). It is a deliberate abortion (fall-
through assertion) in try_window_id, at the final else clause of:
if (first_unchanged_at_end_row
&& first_unchanged_at_end_row->y < it.last_visible_y
&& !last_text_row_at_end)
...
else if (last_text_row_at_end)
...
else if (last_text_row)
...
else if (first_unchanged_at_end_row == NULL
&& last_text_row == NULL
&& last_text_row_at_end == NULL)
...
else
abort(); // <<=============
try_window_id() has been passed the value "selected_window"; so there
must be something wrong with that value or the state of the currently
selected window (I'd guess the latter).
--
emacs21 aborts while typing
https://bugs.launchpad.net/bugs/85146
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