Now I think, it has nothing to do with the rewrite, but with the way revo handles the links. In the login mask html the missing files are linked like this
<link href="/manager/templates/default/css/index.css" type="text/css" rel="stylesheet"></link>
(I already wonder, why the uri starts one level above the manager folder???)
When I call the login with an ssl-proxy, the console gives this
https://ssl-account.com/manager/templates/default/css/index.css
as not found
but
<script type="text/javascript" src="assets/ext3/adapter/ext/ext-base.js"></script>
is listet correct
https://ssl-account.com/mydomain.tld/manager/assets/ext3/adapter/ext/ext-base.js
so, whats going on here and why is modx handling the paths so weiredly
can not imagine, that noone else tried to use an ssl proxy.