I can reproduce the issue.

We can solve this by re-fetching the current saved snippets before updating the saved data. We can then find a way to incorporate the local changes into the existing saved data.

I'll have a look at writing a fix for this.

It looks like all settings are loaded once when opening DevTools and then never loaded again.

I could change it to reload the settings before saving a snippet, but I'm wondering if there's a particular reason not to do that. I think it would also make sense to add a  function to load only one specific setting rather than all settings at once.

So I'm holding off on implementing anything for now and will wait to hear more thoughts on this.

@dgozman or @lushnikov -
Can you, please, advise #3 regarding a reasonable course of action?

I'd try to teach WI.Setting to fire Change event in case of respective "storage" event from window. Important thing is that probably not every client want to react to this events, so it should be opt-in. 

I've got it all working nicely on my local server.

However, in the integrated DevTools the snippets aren't actually stored in localStorage, they are stored as a preference in the "backend". So listening to the "storage" event won't work.

There doesn't seem to be a way to listen to preference changes that occur in the backend. I could refetch the whole preferences with `InspectorFrontendHost.getPreferences` and then incorporate the changes. If that's an acceptable solution I can go ahead with this.

Otherwise I think it would be better for someone else to look into this.

Indeed, there events from pref changing are not implemented yet. However, it should not be hard to do, using pref notifier (https://cs.chromium.org/chromium/src/components/prefs/pref_notifier_impl.h?cl=GROK&gsn=GetPrefs&rcl=1470367490&l=33)

Thanks for the pointers. I've had a look, but I don't feel confident implementing this right now.

There are no plans to work on this in the upcoming year. If you think this is important, please re-file with justification.

Thanks.