Zeroed out conditionings while prompt editing on multiple KSamplers

[shiimizu]

Documenting this behavior.

When prompt editing, make sure a ClipTextEncode++ node is hooked up to one KSampler, not multiple KSamplers. That's because it retrieves the total number of steps from it to generate the corresponding conditionings for prompt editing. A workaround is to duplicate the ClipTextEncode++ node to use for another KSampler.

Related issues: #97 #36

[shiimizu]

Might be fixed as of f74df5b