[Cuis-dev] Clicking the 'collapse' halo handle brings up the debugger

[Pat Foley]

It complains that unidentified object does not understand #canvas.

The unidentified object in question is 'self world', which for the collapse handle comes back #nil. That seems weird.
(There is of course nothing wrong with #collapse, which works fine from the icon and from the menu handle > halo actions.)
P.S.
Why do we still have halos anyway? Almost the only thing I ever use them for is getting an inspector, and I can think of better ways to present that option (and the rest of the options in the debug and in the helpfully titled "menu" handle). Maybe everyone else has lots of uses for them (that are not served by the window frame or the window's icons) but evidently no one has clicked on the collapse handle in a while...
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