gVim doesn't recognize the Meta (Alt) Key in an imap after changing the encoding

Question

In order to edit html files, I have the following three imaps in a file that I source for filetype html:

imap <buffer> <M-[> &uuml;
imap <buffer> <M-;> &ouml;
imap <buffer> <M-'> &auml;

This works fine until I change the encoding of the html file with set enc=utf-8. Now, pressing Alt-[ for example gives me a Û.

Interestingly, after sourcing the same file again, it expands the imaps correctly.

This doesn't really make sense to me. So, why is this and how can I have a more constistent environment regarding imap and utf-8.

This is occuring with gVim 7.1 for Windows.

Answer 1

I meet the same problem with gvim 7.2 on windows xp