Vivaldi latest (based on Chromium) on W10 with Node.JS v8 and Node-RED 0.20.0-beta.2.
Adding a spacer, reordering in the sidebar and deploying gives this in the browser console:
Resizing the spacer and pressing "Done" (not deployed yet) produces:
which hangs the browser.
Interestingly, when I reloaded the admin interface, the spacer had disappeared even though it had previously been deployed.
In fact, it seems clear that doing a "Modified Nodes" deploy doesn't actually deploy the spacer. Trying a full deploy doesn't actually work at all, you get the first error shown above and Node-RED does not stop and restart the nodes.
