Implement orthogonal regions

[mbats]

Today it is possible to create multiple regions but it is not possible to describe orthogonal regions.
See : http://en.wikipedia.org/wiki/UML_state_machine#Orthogonal_regions

[mbats]

See branch compartments.

• The region border should be dashed.
• It should be possible to create vertical or horizontal regions depending on where the user create the second region. If he creates the second region East or West form the first one we will expect horizontal stack for the regions, else if he creates it North or South, it will be a vertical stack of regions.
• There is also a small problem with the rounded corner and the border.

[mbats]

Related to ticket : https://support.jira.obeo.fr/browse/VP-573

[mPorhel]

"There is also a small problem with the rounded corner and the border."

I will look to draw the rounded corner only for the first and last region bottoms of horizontal stacks and for the last region bottom for the vertical stack to avoid issue with the borders (ad future label line separator)

[mbats]

See Sirius bug: https://bugs.eclipse.org/bugs/show_bug.cgi?id=436359

[mPorhel]

See https://bugs.eclipse.org/bugs/show_bug.cgi?id=470770 for the rounded corner issue. A patch set has been added to take the corner dimension to reduce the border line and draw the arcs of the corners. But for the moment, it only draw the arcs of the border attachment figure (Sirius display the left/top border of the compartment excepting the first one).

But IMO, in your case, you do not need rounded corner on the region if we correct the overlap issue.

Current draft patch set 1 result (rounded corner only on RegionContainer):

Current draft patch set 2 result (rounded corner on RegionContainer and Region mappings):

[mPorhel]

The region border should be dashed.

See https://bugs.eclipse.org/bugs/show_bug.cgi?id=461590

[mbats]

Duplicate #397