You are working on the napari/napari repository. The source code is checked out at /testbed at commit…

You are working on the napari/napari repository. The source code is checked out at /testbed at commit…: a task in SWE-Lego-RL-2699 (Harbor dataset). I think the solution here is to enforce the uniqueness before even inserting into the layerlist. I'll submit a PR shortly