* lisp/erc/erc-fill.el (erc-fill--wrap-continued-message-p): Return
nil when current message is a CTCP ACTION. This fixes a regression
introduced by 63d8b2a59a "Make erc-fill-wrap work with left-sided
stamps".
* test/lisp/erc/erc-fill-tests.el: (erc-fill-wrap--merge-action):
New test.
* test/lisp/erc/resources/fill/snapshots/merge-wrap-01.eld: New
test data file. (Bug#60936)