bug#29918: 26.0.90; serial-term error in process filter

[Gemini Lasswell]

Lars Ingebrigtsen <larsi@gnus.org> writes:

> Does setting (setq debug-on-error t) give you a backtrace for these
> errors?

No, but I just made one happen by removing the internal_condition_case_1
wrapper on the read_process_output_call in read_and_dispose_of_process_output.
Then after I got the first backtrace showing that the error was in
term-emulate-terminal I eval-defun'd it to make a more useful backtrace:

term-emulate-terminal.txt
Description: Text document

This is from master.

Thanks for taking a look at this.