https://bugs.wireshark.org/bugzilla/show_bug.cgi?id=5519
--- Comment #1 from Jaap Keuter <jaap.keuter@xxxxxxxxx> 2010-12-24 00:25:30 CET ---
This is actually by design, following this use case:
A (usually heuristic) dissector disrupts your capture disection session. You
can now temporarily disable it, and proceed looking at the packets which
hopefully now are correctly dissected. But you may end up disabling the wrong
protocol after all, causing havoc in your dissection session. To restore the
situation as it was before just Apply the enabled dissectors dialog from the
Analyze menu, as you found out, or restart Wireshark.
If you would disable the protocol 'for real' this way it's always required to
go into the Analyze menu, open the enabled protocols dialog, search for the
dissector you just disabled (hence can't look up the name anymore from the
dissection), re-enable it and close out the dialog.
That is way to cumbersome for an 'undo' action, while it is appropriate if you
would permanently disable this dissector (which you would have to do once).
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