Incremental update adds node at the end in AST instead of on its position in the resource

[soerendomroes]

When using a layout algorithm such as rectPacking that uses the node order in the file as order in which the nodes should be displayed the following may happen:

One has a graph such as this one:

algorithm: rectPacking
aspectRatio: 3

node n1
// node n4
node n2
node n3

This produces the following drawing:

Uncommenting the line produces the following drawing:

After reopening the file the following drawing is created:

This might be a problem in the incremental update.
I propose that incremental update should honor the order that is defined in the file since the current solution produces different drawings without changing the model.

[soerendomroes]

This does only occur if the node is inserted without considering the lexical order of the nodes.