View.compile should depend on engine as well.

[raxoft]

Currently, View.compile takes only content of the view template as an argument. If compiled view cache is enabled (the default) and your project is using multiple engines and it happens that some templates have identical value (which happens for example in case of an empty string, which is the default template value), future View.compile calls may return other engine than the caller of View.compile actually expects. This then naturally leads to quite unexpected application errors.

One possible solution to avoid this would be to pass the engine itself to View.compile as well and make sure the engine.class is part of the checksum created from the template string.