When creating nodes, the property SnapToGrid is not used to set the height and width

[peransin-obeo]

When a new node is created (automatically in a refresh or using a tool or an operation), only the top/left point is place on the grid.
The 3 other corners are usually not the grid as width and height are not consider when user does not perform a drag-n-drop (simple click).

This happens in the case when a property influences a dimension of the element or not.
In both cases, user would usually expect the node to adjust to the grid by expanding the (default or computed) size to Grid-step multiplication product.

The modification could occur in:

sirius-desktop/plugins/org.eclipse.sirius.diagram.ui/src-diag/org/eclipse/sirius/diagram/ui/internal/refresh/AbstractCanonicalSynchronizer.java

Line 747 in 03aee7f

updateBoundsConstraint(createdNode, size, location, abstractDNode);

Before updating the bounds, adjust the size to the grid if necessary and possible.
As this only concern new element, existing diagram would not be impacted.