Bug 497449

Summary:	Improve technically the collapse of regions
Product:	[Modeling] Sirius	Reporter:	Laurent Redor <laurent.redor>
Component:	Diagram	Assignee:	Project Inbox <sirius.diagram-inbox>
Status:	NEW ---	QA Contact:
Severity:	enhancement
Priority:	P3	CC:	pierre-charles.david
Version:	unspecified	Keywords:	triaged
Target Milestone:	---
Hardware:	All
OS:	All
Whiteboard:

Description Laurent Redor

2016-07-07 02:57:01 EDT

As explained in commits [1] and [2], the height and width have been set to -1 in AirXYLayoutEditPolicy.getConstraintFor(Request, GraphicalEditPart, Rectangle) for facility reason:
* commit [1] to react to show/hide label
* commit [2] to react to collapse of horizontal stack regions.

I think it would be better to directly handle these constraint in the "resize" commands:
* RegionCollapseAwarePropertyHandlerEditPolicy.getLayoutConstraintsCommand(boolean, Command) for collapse case
* Another policy/request for show/hide label case

[1] http://git.eclipse.org/c/sirius/org.eclipse.sirius.git/commit/?id=77d6b28496cd23c13e37484c66b12358b9f33bf4
[2] http://git.eclipse.org/c/sirius/org.eclipse.sirius.git/commit/?id=656a1a52e2e29e08e77d783fa2e690a140311ffb