.Page.Scratch not reset on rebuilds in live-reload

[bep]

This was kind of accidentally introduced in Hugo 0.40. I guess I was tired. This is related to live-reloads (not fuill builds) and .Scratch.Add.

Not 100% sure this should be fixed, though, as to get some kind of control of this global state, you should set it to a known initial value before adding to it.

{{ .Scratch.Set "counter" 0 }}
{{ .Scratch.Add "counter" 1  }}

/cc @regisphilibert

[bep]

But I guess that, looking at the recent gallery example in the forum, we should fix this.

[github-actions]

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