[Cuis-dev] Fix resize pointer bug in LayoutAdjustingMorph

[Facundo Javier Gelatti]

I attach the changes to fix a bug where the pointer image gets stuck as the
resize cursor.

Here are the steps to reproduce the bug:

   1. Click on any morph and hold mouse button 1 (right-click and hold).
   2. Drag across a pane splitter or window edge.
   3. Continue dragging away, and the cursor stays stuck as resize.


After the attached changes get filed-in, if you're already dragging
(holding button 1) and go across a layout adjusting morph, then the pointer
does not change to the resize cursor (and because the user is already
dragging, they won't be able to resize anyway); see #mouseEnter:.
At the same time, if you are in the middle of performing a resize, we do
want the pointer to keep being the resize cursor. So, if `hand` is not nil,
we don't restore the default cursor; see #mouseLeave:.

Cheers!
Facu
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