fix: (WIP!) fix weirdest bug ever

How did this ever work before? I'm flabbergasted.

Author: ca-d

handleEdit.spec.ts

@@ -267,10 +267,6 @@ describe("handleEdit", () => {
             return true;
           },
         ),
-        {
-          seed: 1017362841,
-          path: "1",
-        },
       )).timeout(20000);
 
     it("changes the document the same way when redoing undone edits", () =>

handleEdit.ts

@@ -73,9 +73,6 @@ function handleSetAttributes({
             [name]: element.getAttributeNS(ns, name.split(":").pop()!),
           };
         });
-      Object.keys(attrs!).forEach((name) => {
-        delete oldAttributesNS[ns]![name];
-      });
     });
 
   // change element's namespaced attributes