/me should conform to XEP-0245

XEP-0245 also states the string should show up italic.

Currently the procedure ::IRCActions::ParseWordHook (IRCActions.tcl) checks if each word in a string matches "/me". Words are passed to this procedure by ::Text::ParseMsg (Utils.tcl). This function strips leading spaces which is why #3 goes wrong. #7 goes wrong because all words are parsed in a string.

Maybe ::Text::ParseMsg should be rewritten so that it only checks the word defined by the first character in a string until the next space. I don't think there is a need to check every word, do we? Alternatively (maybe better), we can use textPreParseHook which is not yet defined. The second option may also make it easier to set the "-slant italic" font option on the whole string (incread of only the word).

What do you think?

Yes, checking every word as it seems to be right now, seems to be too much. AFAIK there is no IRC command that starts somewhat in the middle of a text message.
They always begin with
/command
on a new line.

I haven't yet looked at the code, however, if you think the second option is easier to implement, and later to maintain, then we probably should take that route.