Snakemake version

snakemake v7.21.0 (python v3.11.0)

Describe the bug

When passing the --show-failed-logs flag to snakemake, it outputs the job logfile to the terminal.
The problem is that it surrounds the output with ='s of the same length as the longest line in the logfile, meaning that if there's one very long line it'll also generate an excessive amount of these ='s.

Code block responsible for formatting the output:

Line that determines the number of ='s:

My recommendation is to limit the maximum to a sensible amount, e.g.:

- max_len = max(max(len(l) for l in lines), len(logfile_header))
+ max_len = min(max(max(len(l) for l in lines), len(logfile_header)), 80)

Logs

Example output:

Logfile xxx.log:
=============================================== .... x20,000 (not a joke)
Traceback (most recent call last):
  ...
    raise ValueError('Feature IDs found in the table are missing from the '
ValueError: Feature IDs found in the table are missing from the taxonomy: {'9ebc0b1c8dcfd254536036e859d618e8', '8cb8a9a7de5b414f27b96dd6edd57f40', 'd294e6a09f8f7396578d587e102623ab', 'abb551a9eca02618824e611157f85bb0',  ....'1c6e92aad743c0e3b0531a87b47e7daf', '116a46a73c4fd21c5b6a08ad5f561485'}

See above for debug info.
=============================================== .... x20,000 (not a joke)

Minimal example
snakemake --show-failed-logs with a failing rule that writes a very long line to the logfile.

Additional context