[Cuis-dev] Small change in PluggableScrollPane

[Alan Ferrise]

Hi, I noted a small bug when I was doing some exercises in Cuis so I tried
to fix it:
[image: image.png]
When the mouse is over a button and you scroll, it ends up scrolling the
text that sits behind the active window, which in this case is the Terse
Guide.

I started looking how to fix this and I found that PluggableScrollPane is
the class responsible for modeling scrolling windows. I noted that it
doesn't listen to mouseOver events, so I did it and added an instance
collaborator named mouseIsOver, whose value is checked when the mouseScroll
event is called. This seems to have fixed the problem.
I then looked its sibling class, PluggableButtonMorph, that listens to the
mouseOver events in the same manner that I end up implementing it in
PluggableScrollPane, which make me wonder if I had to put mouseIsOver in
their superclass, however, I ended up discarding the idea.
I include the ChangeSet with the changes.

Thanks in advance.
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