view.Writer is missing in inputTransformation event

[scofalik]

At the moment the document fragment available in inputTransformation event callbacks is useless, because there's no convenient way to modify it. We are modifying model/view trees through model/view writers, unfortunately, view.Writer instance is not available inside inputTransformation callbacks.

My proposition is to make it available as another parameter (next to data) or as a parameter inside data object. We could use view.View#_writer but it is private. Or we can create a new view.Writer instance for clipboard pipeline.

[f1ames]

Seems like new writer https://github.com/ckeditor/ckeditor5-engine/issues/1501 could be suitable for this.

[jodator]

@Reinmar I'd like to raise this issue. As we have this in the docs: https://github.com/ckeditor/ckeditor5-clipboard/blob/74c3c43085cb414696eafeddc31e354eeb3f0f1a/docs/framework/guides/deep-dive/clipboard.md#L70-L77

Which implies to import something from the engine aaaaand we tend to avoid it :) (#667, https://github.com/ckeditor/ckeditor5-engine/issues/1555, https://github.com/ckeditor/ckeditor5-engine/issues/1556).

I was to propose something similar as @scofalik proposed. Adding even a data.writer = new UpcastWriter() there will be sufficient.

ps.: I've stumbled upon this while doing PR review.

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