Prevent SDCPN min zoom ratcheting on zoom-in

Author: cursoragent

libs/@hashintel/petrinaut/src/views/SDCPN/sdcpn-view.tsx

@@ -51,7 +51,7 @@ const fitZoomToNodes = debounce(
   (
     instance: PetrinautReactFlowInstance | null,
     canvasContainer: React.RefObject<HTMLDivElement | null>,
-    setMinZoom: (minZoom: number) => void,
+    setMinZoom: React.Dispatch<React.SetStateAction<number>>,
   ) => {
     const minMaxCoords = instance?.getNodesBounds(instance.getNodes());
     const viewportSize = canvasContainer.current?.getBoundingClientRect();
@@ -62,12 +62,17 @@ const fitZoomToNodes = debounce(
         viewportSize.width / minMaxCoords.width,
       );
       const currentZoom = instance?.getViewport().zoom;
-      // Don't reduce the zoom level below the users current zoom
-      const safeZoom = currentZoom
-        ? Math.min(currentZoom, newZoom * ZOOM_PADDING)
-        : newZoom * ZOOM_PADDING;
+      setMinZoom((currentMinZoom) => {
+        // Don't increase min zoom beyond the currently configured minimum.
+        // On first initialization (min zoom still 0), cap to the user's current zoom.
+        if (currentMinZoom === 0) {
+          return currentZoom
+            ? Math.min(currentZoom, newZoom * ZOOM_PADDING)
+            : newZoom * ZOOM_PADDING;
+        }
 
-      setMinZoom(safeZoom);
+        return Math.min(currentMinZoom, newZoom * ZOOM_PADDING);
+      });
     }
   },
   100,