[Feature Request]: Implement A1111 prompt Editing

[adumont]

Is there an existing issue for this?

• I have searched the existing issues and checked the recent builds/commits

What would your feature do?

Prompt editing allows you to start sampling one picture, but in the middle swap to something else.

The base syntax for this is:

[from:to:when]

The feature is further described here:

https://github.com/AUTOMATIC1111/stable-diffusion-webui/wiki/Features#prompt-editing

Proposed workflow

Use in prompt as defined in the syntax.

Additional information

No response