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In RAP 2.1 the only way to change a theme is to create a specific entry point per theme. The problem with this approach is that changing the theme implies changing the URL which is not always acceptable. For example in our case the application administrator is the one choosing the theme and the theme has to be applied to all users connecting to the platform. So in this case having an URL per theme is no really acceptable. Another usecase could be to let the user choose the theme and store it in the preferences. You don't want the URL to change either in such a usecase. See also forum thread http://www.eclipse.org/forums/index.php/t/526867/
This would be a useful feature for our customers too.
I have submitted a patch in github with this pull request "A patch proposal for enhancement 419098"