Create two layers A and B in category Working
Click on layer A
Shift press Layer B (note I did not click, but just pressed without releasing)
Move the two selected layers in another Category
==> throws the following exception :
Exception in thread "AWT-EventQueue-0" com.vividsolutions.jts.util.AssertionFailedException: If this event is being fired because you are constructing a Layer, cat will be null because you haven't yet added the Layer to the LayerManager. While constructing a layer, you should set firingEvents to false. (Layerable = Nouvelle Couche (2))
at com.vividsolutions.jts.util.Assert.isTrue(Assert.java:71)
at com.vividsolutions.jump.workbench.model.LayerManager.fireLayerChanged(LayerManager.java:445)
Sorry, the exact sequence is :
Click on layer A
Shift doucle click Layer B without releasing the button after second click (layer B should be in edit mode, shift is still pressed).
Move the two selected layers in another Category
==> Exception
After this first bug, another one may appear :
Select layer A
Shift double click layer B
Layer A and B are selected, B is in edition mode
Release shift key and press control
Left click on another category
==> Layer B is duplicated in this category with the same name (nor really duplicated as this is the same layer which is shown in bith categories)
Found an even simpler case :
Just create one layer A
Double click it without releasing (or simple click + mouse press)
Shift the layer in another category
==> throws exception (while removing layer from original category)
==> does not add it in new category
==> OpenJUMP becomes instable (layer has been removed from its category but is still visible)
Fix in r3921