[2195] Set border color to None now set the color to none

Instead of set the color to a default color

Bug: #2195
Signed-off-by: Axel RICHARD <axel.richard@obeo.fr>

CHANGELOG.adoc

@@ -59,6 +59,7 @@ A suitable implementation is to get the id of the `self` object using `IObjectSe
 - https://github.com/eclipse-sirius/sirius-components/issues/2222[#2222] [tree] Fix an issue where all the tree items where editable, even for elements that have no label.
 - https://github.com/eclipse-sirius/sirius-web/issues/2245[#2245] [sirius-web] Fix an issue when triggering expandAll on models with multiple root objects.
 - https://github.com/eclipse-sirius/sirius-web/issues/2333[#2333] [diagram] Fix a warning console when opening a palette on a diagram.
+- https://github.com/eclipse-sirius/sirius-web/issues/2195[#2195] [view] Fix an issue where a border color set to _None_ would set the color to a default color, not none.
 
 === New Features
 
@@ -68,7 +69,7 @@ A suitable implementation is to get the id of the `self` object using `IObjectSe
 - https://github.com/eclipse-sirius/sirius-web/issues/2253[#2253] [diagram] Add the possibility of organizing palette tools into sections
 - https://github.com/eclipse-sirius/sirius-web/issues/2236[#2236] [forms] It is now possible to use `For` and `If` constructs inside the definition of Form (currently only inside _Groups_ and _Flexbox containers_).
 Both constructs are commonly combined together, with e.g. _For_ iterating on the different features of the current semantic element and several _If_ inside the loop to decide which concrete widget(s) to instantiate depending on the feature's type.
-They can however also be used independently (e.g. a single _If_ ouside of a _For_ to make the presence of a widget conditional) and combined in arbitrary ways (e.g. nested loops or conditionals).
+They can however also be used independently (e.g. a single _If_ outside of a _For_ to make the presence of a widget conditional) and combined in arbitrary ways (e.g. nested loops or conditionals).
 Note that this first version has a known limitation: _FormDescriptions_ which use _For_ or _If_ elements can not be reliably edited using the _Form Description Editor_.
 This will be fixed in the next version.
 

packages/view/backend/sirius-components-view-emf/src/main/java/org/eclipse/sirius/components/view/emf/diagram/StylesFactory.java

@@ -152,7 +152,7 @@ public INodeStyle createNodeStyle(NodeStyleDescription nodeStyle, Optional<Strin
                                          .filter(FixedColor.class::isInstance)
                                          .map(FixedColor.class::cast)
                                          .map(FixedColor::getValue)
-                                         .orElse(DEFAULT_COLOR))
+                                         .orElse(""))
                     .borderSize(nodeStyle.getBorderSize())
                     .borderStyle(LineStyle.valueOf(nodeStyle.getBorderLineStyle().getLiteral()))
                     .borderRadius(nodeStyle.getBorderRadius())
@@ -181,7 +181,7 @@ public INodeStyle createNodeStyle(NodeStyleDescription nodeStyle, Optional<Strin
                                         .filter(FixedColor.class::isInstance)
                                         .map(FixedColor.class::cast)
                                         .map(FixedColor::getValue)
-                                        .orElse(DEFAULT_COLOR))
+                                        .orElse(""))
                    .borderSize(nodeStyle.getBorderSize())
                    .borderStyle(LineStyle.valueOf(nodeStyle.getBorderLineStyle().getLiteral()))
                    .borderRadius(nodeStyle.getBorderRadius())