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

[J.P.]

Recent work on this feature introduced an annoying regression.

>From emacs -Q:

  1. M-: (erc-tls :server "testnet.inspircd.org") RET
  2. /JOIN #test and say something
  3. M-: (setq erc-timestamp-last-inserted-left nil) RET to reset the
     date stamp's deduping snapshot
  4. Say something else
  5. Notice that point has been dislodged from the prompt and that a new
     date stamp has not been inserted

The second of the attached patches should fix it.

0001-5.6-Fix-concurrency-bug-in-erc-buffer-display-test.patch
Description: Text Data

0002-5.6-Preserve-point-when-inserting-date-stamps-in-ERC.patch
Description: Text Data