Hi, Hannes.
The generic event handler, which can be configured via #on:send:to:, kicks in at the level of Morph >> #mouseDown: here. For historic reasons, the halo invocation kicks in earlier at the level of Morph >> #handleMouseDown:. Well, since #handleMouseDown: is considerend framework code and #mouseDown: application code, this is a good thing because applications cannot easily overwrite the halo functionality. However, we should, for the future, make the means of interaction for halo invocation configurable so that there is a chance for applications to make use of the blue button at all. For example, if you do not need [CMD]+[SHIFT]+[B] in your application, you may want to re-map halo invocation to that. :-) An event filter could be used to achieve this.
Best, Marcel
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