[3934] Remove helper lines when moving pinned elements

Bug: #3934
Signed-off-by: Florian ROUËNÉ <florian.rouene@obeosoft.com>

CHANGELOG.adoc

@@ -81,6 +81,7 @@ As a result, the following maven modules have been deleted: `sirius-web-sample-a
 - https://github.com/eclipse-sirius/sirius-web/issues/3899[#3899] [diagram] Fix an issue when using alt-tab shortcut and trying to drag a node afterwards
 - https://github.com/eclipse-sirius/sirius-web/issues/3911[#3911] [diagram] Fix overflow issue with labels, ensuring proper wrapping and ellipsis.
 - https://github.com/eclipse-sirius/sirius-web/issues/3933[#3933] [vs-code] Fix explorer in vscode extension
+- https://github.com/eclipse-sirius/sirius-web/issues/3934[#3934] [diagram] Remove helper lines when moving pinned elements
 
 === New Features
 

packages/diagrams/frontend/sirius-components-diagrams/src/renderer/helper-lines/useHelperLines.tsx

@@ -309,8 +309,9 @@ export const useHelperLines = (): UseHelperLinesValue => {
         const nodePositionChanges = changes.map((change) => change as NodePositionChange);
         const movingNodes: Node[] = nodePositionChanges
           .map((change) => nodeInternal.get(change.id))
-          .filter((node): node is NonNullable<typeof node> => node !== undefined);
-        if (movingNodes) {
+          .filter((node): node is NonNullable<typeof node> => node !== undefined)
+          .filter((node) => !node.data.pinned);
+        if (movingNodes && movingNodes.length > 0) {
           const movingNodesBounds = getRectangularBounds(nodePositionChanges, movingNodes);
           const helperLines: HelperLines = getHelperLinesForMove(
             movingNodesBounds,