Use min value instead of average value to order bus cells

[So-Fras]

Signed-off-by: Sophie Frasnedo sophie.frasnedo@rte-france.com

Please check if the PR fulfills these requirements (please use '[x]' to check the checkboxes, or submit the PR and then click the checkboxes)

• The commit message follows our guidelines
• Tests for the changes have been added (for bug fixes / features)
• Docs have been added / updated (for bug fixes / features)

What kind of change does this PR introduce? (Bug fix, feature, docs update, ...)
Feature

What is the current behavior? (You can also link to an open issue here)
The position of the cell on the bus bar is determined by the average position numbers of its components.

What is the new behavior (if this is a feature change)?
The position of the cell on the bus bar is determined by the minimum position number among its components.

[flo-dup]

Looking at previous lines below, it seems that they are unneeded, maybe we can take the opportunity to remove them

powsybl-diagram/single-line-diagram/single-line-diagram-core/src/main/java/com/powsybl/sld/layout/positionfromextension/PositionFromExtension.java

Lines 120 to 124 in 2dfc72b

	graph.getNodes().stream().filter(node -> node.getDirection() != Direction.UNDEFINED && graph.getCell(node).isPresent()).forEach(node -> {
	BusCell cell = (BusCell) graph.getCell(node).get();
	cell.setDirection(node.getDirection());
	node.getOrder().ifPresent(cell::setOrder);
	});

[flo-dup]

In fact the mentioned lines should be removed but I forgot one thing: you should set the direction of the bus cell inside the graph.getBusCellStream().forEach() part. Currently, in the mentioned lines, the last node in the stream decide the direction if there are several different directions, and this is bad. You should check that the directions are coherent, and log a warning (throw an exception is maybe too harsh) if they're not.

[sonarqubecloud]

Kudos, SonarCloud Quality Gate passed!   

0 Bugs
0 Vulnerabilities
0 Security Hotspots
0 Code Smells

82.4% Coverage
0.0% Duplication