Use correct end handle position when drawing a connection (#4382)

* use correct end handle position \when drawing connection lines

* provide correct connection end handle, also when connection is invalid

* add end handle position to connection despite being invalid

* chore(connectionline): remove logs

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Co-authored-by: moklick <info@moritzklack.com>

packages/svelte/src/lib/store/derived-connection-props.ts

@@ -88,7 +88,9 @@ export function getDerivedConnectionProps(
       const fromX = (fromNode?.internals.positionAbsolute.x ?? 0) + fromHandleX;
       const fromY = (fromNode?.internals.positionAbsolute.y ?? 0) + fromHandleY;
       const fromPosition = fromHandle?.position;
-      const toPosition = fromPosition ? oppositePosition[fromPosition] : undefined;
+      const toPosition =
+        connection.connectionEndHandle?.position ??
+        (fromPosition ? oppositePosition[fromPosition] : undefined);
 
       const pathParams = {
         sourceX: fromX,