bug#60936: 30.0.50; ERC >5.5: Add erc-fill style based on visual-line-mode

[J.P.]

"J.P." <jp@neverwas.me> writes:

> v10. Redo some key bindings. Remove unneeded Compat functions. Rename
> `erc-message' text prop to `erc-command'. Revive mistakenly deleted hunk
> in erc-match.

This module probably shouldn't be hiding fringes without good reason or
calling `set-window-margins' on whatever window happens to be selected.
The current behavior also carries the potential to pollute the test
suite.

I've gone ahead and installed a small fix that hopefully addresses these
concerns. Thanks.