[Drag & drop, intro] Blockquote formatting is lost

[Witoso]

📝 Provide detailed reproduction steps (if any)

In the experimental drag and drop:

Nagranie.z.ekranu.2023-07-11.o.14.49.29.mov

✔️ Expected result

Formatting is preserved.

❌ Actual result

Formatting is lost.

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[filipsobol]

What should happen when only part of the blockquote is selected? Is it "all or nothing" or should we automagically split the blockquote?

[Witoso]

What should happen when only part of the blockquote is selected? Is it "all or nothing" or should we automagically split the blockquote?

I would say that we need to do a bit of predicting of the user intent (and choosing what's the strongest/most popular/maakes more sense).

Possible intents of partial select and dragging:

1. I would like to split the quote into two quotes (it's too big? Parts of the quote in different parts of the document?)  
2. I would like to extract something out of the quote. (I think this one is tricky, why it ended up in a quote? Semantically, part of a quote is a quote, extracting something to not be a quote only makes sense when it was added there mistakenly?).

I'm leaning towards, no 1. As an experiment, I added a quote from you to the top, and I wanted to extract "Is it (...)" to pull it above this sentence as a quote. This is a valid case, and nice behavior (if it worked 😛 ). WDYT? @dagdzi

[dagdzi]

@Witoso I am also leaning towards solution no 1.

Code blocks currently behave this way, and I think it's intuitive. When we repeat this behavior in the case of blockquote, it will also be a consistent solution.

[filipsobol]

Due to technical limitations, in the PR #14891 we will only add support for extending the range when ALL child elements are selected. I've created a new issue #14940 to also extend the range when the selection touches the beginning or end of the parent elements.

@Witoso I've added this new issue to the list of New behaviors under the things could be moved v2. group in our D&D epic. Feel free to move it if you don't agree with this.

[Witoso]

@filipsobol not sure what are the product/user consequences, it's a bit too tech for me to decide 😄

[filipsobol]

Sorry, let me explain this better using the blockquote example from above.

With PR #14891, the blockquote style is only maintained if EVERYTHING within it is selected before dragging (Example 1).

However, it would be nice to maintain the blockquote style when the selection doesn't include everything, but touches the beginning or end of the blockquote (Examples 2 and 3). This is skipped for now due to technical limitations described in #14940.

Once this is fixed, the blockquote style will NOT be copied only if the selection doesn't touch any of the blockquote ends (Example 4).

Example 1: ✔️ The blockquote style is copied when all paragraphs are selected.

Example 2: ✔️ The blockquote style is copied when the first two paragraphs are selected (currently skipped).

Example 3: ✔️ The blockquote style is copied when the last two paragraphs are selected (currently skipped).

Example 4: ✖️ The blockquote style is NOT copied when only the middle paragraph is selected.

[Witoso]

Gotcha, so for now let's do the simplest case I agree, then we can move to more specific scenarios.