Vincent Sanders 4dc4d8b318 add miscellaneous event to browser window callback table
extend the browser window callback table with a miscallaneous event
 entry. This is used to replace all browser window callbacks which
 take no parameters.

This reduces the API surface from seven separate calls to a single
 call with an enumeration which may be readily extended.

The initial implementation in the frontends simply calls the original
 implementations to reduce scope for errors.
2019-08-20 00:16:52 +01:00
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