Isolate block drag handles from selection and editing

packages/block-editor/src/canvas.ts

@@ -22,6 +22,10 @@ export function mountBlockCanvas(root: HTMLElement, tree: BlockNode, options: Mo
         handle.setAttribute("aria-label", `Move ${node.type}`);
         handle.style.touchAction = "none";
         handle.textContent = "⋮⋮";
+        // Clicks must not bubble into selection or inline-edit handlers.
+        // Pointer/keyboard sensor events remain available to the DnD backend.
+        for (const name of ["click", "dblclick"])
+          handle.addEventListener(name, event => { event.preventDefault(); event.stopPropagation(); });
         element.prepend(handle);
         cleanup.push(() => handle.remove());
       }