This bug sould be filled under gtksourceview component, shouldn't it ?

Not sure... if the original reporter means syntax highlighting for wiki markup,
then it's a gtksourceview issue, if instead the reporter means a plugin to add
to gedit specific features that ease the editing of that wiki then the request
for a gedit plugin is correct.

To be honest I'm tempted to WONTFIX this either way: there are a zillion of
different wikis, web apps etc and we cannot support them all upstream, if
someone makes a plugin to ease wiki editing that would be very cool, but it can
be probably distributed separately. The problem with specific syntax
highlighting is that each of these wikis do not have a registered filetype and
mimetype, thus including the syntax highlighting in sourceview makes little
sense. The aforementioned plugin could however use gtkourceview apis
programmatically to set a specific highlighting, since in this case only the
caller knows that gedit should use a specific highlighting for the file.

I ment something like this:
http://wikipedia.mozdev.org/

I don't think this plugin is of such general use to be included in gedit itself.
Though, I think such a plugin would be useful for some persons and I'd love to
see it implemented (like I'd like to see similar plugins for HTML, XSL, LaTeX,
etc.).

Here my ideas:
- Thilo: in the mean time you could try to write a taglist for the taglist plugin
- We could add an "Ideas for new plugins" section to gedit web site
- We could try to design a generic plugin that takes in input one or more XML
files (similar to the taglist plugin ones) and create toobars.

We are moving all the request for plugins that we don't plan to add to gedit itself on live.gnome.org/Gedit.

Closing as WONTFIX.