Improve erc-fill-wrap-merge refilling and movement

* lisp/erc/erc-fill.el (erc-fill--wrap-escape-hidden-speaker): Add
parameter to suppress escaping of hidden prefixes.
(erc-fill--wrap-beginning-of-line): Remember original value of point,
and pass it to `erc-fill--wrap-escape-hidden-speaker'.
(erc-fill--wrap-previous-line, erc-fill--wrap-next-line): Guard call
to `erc-fill--wrap-escape-hidden-speaker' with conditional check for
`erc-fill-wrap-merge'.
(erc-fill--wrap-insert-merged-pre): Add additional text property,
`erc-fill--wrap-merge', to help identify `display' regions servicing
`erc-fill-wrap-merge'.  This should make resolving inconsistencies
easier when "splicing" new messages between existing ones.
(erc-fill-wrap): Add `erc-fill--wrap-merge' text property to merged
speaker region.
(erc-fill--wrap-rejigger-region): Remove assertion disallowing a
non-nil `erc-fill--wrap-rejigger-last-message'.  Instead, adopt the
existing value of that variable when shadowing it for the remaining
extent of the function's execution.  When removing the `display'
property, also look for nonempty replacement text, such as values
specified by the option `erc-fill-wrap-merge-indicator'.
(erc-fill--wrap-merged-button-p): Look for `erc-fill--wrap-merge'
property instead of `display'.
* test/lisp/erc/resources/fill/snapshots/merge-01-start.eld: Update.
* test/lisp/erc/resources/fill/snapshots/merge-02-right.eld: Update.
* test/lisp/erc/resources/fill/snapshots/merge-wrap-01.eld: Update.
* test/lisp/erc/resources/fill/snapshots/merge-wrap-indicator-pre-01.eld:
Update.
* test/lisp/erc/resources/fill/snapshots/spacing-01-mono.eld: Update.
(Bug#60936)

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