Nice timing!  Just as I am about to go on vacation and don’t have much time (and only a very slow computer) they go and release a major new version of WordPress!  Ah well, I have managed to perform a quick test with both of my plugins on the new version and I am happy to say that:

  1. AZIndex seems to be working fine, and
  2. TinyMCE Entities Patch is obsolete

Yes, it’s actually good news that my TinyMCE Entities Patch plugin is no longer necessary — WordPress has fixed the bug my plugin was designed to fix.  I may get the chance to update the plugin tomorrow so that those who installed it so they could keep the spaces around will still be able to use it, but I can’t promise anything at this point.

UPDATE: Well, I spoke too soon yesterday — there was a problem that many other plugins also seem to have stumbled over thanks to a change in the get_option WordPress function (naughty WordPress!).  I have updated AZIndex to v0.5.4 with a workaround for the problem on WP 2.6.  The plugin should continue to work with WP 2.5 and WP 2.5.1, and with WP 2.6 even if they revert the behaviour of get_option back to the way it was in 2.5.1.