Tooltips don't work on CheckListEditor

[nicolasap-dm]

Tooltips don't seem to work on CheckListEditors. All other Items I tested, including items editing List traits, work fine, but CheckListEditors don't. Tested on Linux and Windows with pyside2.

Made using:

class HasCheckList(HasTraits):

    checklist = List(value=["foo"])
    checkbutton = Bool(False)

    traits_view = View(
        Group(
            Label("<b>Tooltip not working:</b>"),
            Item( 
                "checklist", 
                label="Check list editor",
                style="custom", 
                editor=CheckListEditor(values=["foo", "bar", "baz"]), 
                tooltip="Can't see this!",
            ),
            Label("<b>For comparison:</b>"),
            Item("checklist", label="Default editor", tooltip="Can see this"),
            Item("checkbutton", tooltip="Can see this")
        )
    )

HasCheckList().configure_traits()