for list items.

occurring in LocationPanel.py - a check is made to see if the current
world location is within the image bounds. If it is not, the voxel
location is updated (and clamped to its bounds), but voxel location
listeners are not notified thanks to the new enable/disableNotification
methods on PropertyValue objects).

so bits of code can knowingly set properties to bad values, but disable
any bad side effects due to those bad values.

location across changes in the selected image.

class. LightBoxPanel registers mouse clicks/movement, and syncs with
LightBoxCanvas and ImageList location. LightBoxCanvas has a couple of
new methods for transforming from pixel coordinates to LBCanvas
coordinates, and then on to image world coordinates. LightBoxCanvas
draws a cursor at the current location (about to improve this).

refactors. Is now functional and reasonably clear to follow.

ImageList.location is now removed when OrthoPanel is destroyed.

replaced with a single method,
canvasToWorld. SliceCanvas._updateDisplayBounds can be passed
xmin/xmax/ymin/ymax values. Convenience methods added on
PropertyBase/Value objects to set the preNotifyFunction
(although I probably won't end up using this).

fixing, a couple of commits back.

patch PropertyValueList so that new values set via __setitem__ are
cast (using the appropriate PropertyValue object cast method) before the
list values are set. This is because, while the PV values were being
clamped to their appropriate range, the list values were not.

is empty.

they were not being calculated correctly.

too complicated to support this whilst also supporting changes to
individual PropertyValue items which may (temporarily) invalidate
the value of the list as a whole.

individual values don't get validated.