40287
14179 deprecate the method in UIManager "deprecated" category	https://pharo.fogbugz.com/f/cases/1417914162 Replace Announcer>>#on:send:to:s senders in Morphic-Widgets-Tree	https://pharo.fogbugz.com/f/cases/1416214173 remove #allowBlockArgumentAssignment preference	https://pharo.fogbugz.com/f/cases/14173

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