Segment resize leaves white trail on canvas

Originally reported in 1184543

In V1_0 CVS 29/5/04/Suse9.1

Summary:
Reducing and then increasing segment size
behaves differently depending on if you work from the left,
or the right.

To recreate:

Create a small segment containing notes throughout.
Select resize.
From the LEFT of the segment, resize smaller, release, and
then resize back to its original size.
Observe that the notes in the area which was "deleted" by
the original "resize smaller" have disappeared.

Revert back to the fullsize segment prior to the above
test.
Now resize smaller from the RIGHT and release.
Observe that the white "trail" of notes isn't completely
removed, but the notes aren't showing when you go into
notation editor or event list editor, and aren't saved
on file.
Now resize back to the original size.
The notes"deleted" by the "resize smaller" reappear.

I've attached the small file used to test this.