HeaderBar non-draggable window issue

[Michael Strauß]

Hi Cormac,

that's not a bug: On Windows, the top resize border is inside of the
window, while the other three resize borders are outside of the window. You
only get a resize cursor if the area below the cursor is draggable, which
your green HBox is not. If you make it draggable, then you'll also get a
resize cursor. This is by design, as the resize border shouldn't overlap
client elements (in our case, elements that are not draggable).

The fact that you get a resize cursor for the top edge of the red label
looks like it may have something to do with the fact that it's a label, but
in reality the label is just placed close enough to the top edge of the
window so that the resize border extends a tiny bit over the label (which
is draggable).
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