Remove array of paragraphs structure from the text block

[ellatrix]

This seems to be a remainder from the multi paragraph structure. Currently this causes a bug with the placeholders as well when initialising the editor:

this.state = {
	empty: ! props.value || ! props.value.length,
};

[codecov]

Codecov Report

Merging #2133 into master will increase coverage by 0.05%.
The diff coverage is 100%.

@@            Coverage Diff             @@
##           master    #2133      +/-   ##
==========================================
+ Coverage   22.93%   22.99%   +0.05%     
==========================================
  Files         142      142              
  Lines        4403     4393      -10     
  Branches      749      745       -4     
==========================================
  Hits         1010     1010              
+ Misses       2859     2853       -6     
+ Partials      534      530       -4

Impacted Files	Coverage Δ
blocks/library/heading/index.js	23.8% <ø> (+7.68%)	⬆️
blocks/library/pullquote/index.js	33.33% <100%> (ø)	⬆️
blocks/library/quote/index.js	14.28% <100%> (ø)	⬆️
blocks/library/paragraph/index.js	47.05% <100%> (ø)	⬆️

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[youknowriad]

Did you check the transformations to/from text?

[ellatrix]

Yeah. Did you encounter problems?

[youknowriad]

@iseulde no I haven't had the time to test the branch yet. It's just that when I do this kind of changes, I often miss the switcher and have to fix it afterwards.

Will check the branch a bit later.

[youknowriad]

This works great for me but there's the Heading to Text transformation we could update to drop all the multi-paragraph logic, it should be way simpler now 👍

[ellatrix]

@youknowriad Did some cleaning up.

• Somehow the remapping of paragraphs seems weird. It should already have keys from dom-to-react... Need to have a look where they have gone.
• Transforming a quote back to text feels weird to me. I'd expect the whole quote transformed into multiple text blocks... (I guess I also expect being able to select multiple text blocks and make a quote, see Add multi select inspector #1811.)

[mtias]

Is this good to go?

[ellatrix]

Waiting for a review :)

[youknowriad]

I noticed a small bug, not certain that it was introduced by this PR, but when transforming a quote with one paragraph and without a citation, we should just create a text block and not a text block and an empty quote

[ellatrix]

@youknowriad I see this errors atm in master and works here? Still creates an empty code, but didn't change the logic there...

[youknowriad]

@iseulde ok let's merge this, it resolves the master errors and we could remove the empty quote later