With Direct Selection, a Shift-click on a corner widget toggled its
corner. With the path selected whole every corner already is, so the
first Shift-click deselected the corner clicked and hid its widget,
leaving the others. While every corner is selected, a Shift-click now
picks that corner alone, as the first click of "click one widget, then
Shift-click the others" does; with some corners picked it still toggles.
Sven Lafebre
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