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Pasting text with line breaks on portable text generates wrong structure

See original GitHub issue

When pasting a text with line breaks in Sanity Studio, the wrong structure is generated. Maybe it’s also worth emphasizing that I’m using Ubuntu. Example:

This is a paragraph.

This is another paragraph.

This is yet another paragraph.

NOTE: DO NOT directly copy this text from here. Paste it in a notepad, copy from there and then paste it into a portable text.

Current structure:

{ 
  "content": [
    {
      "_type": "block",
      "markDefs": [],
      "style": "normal",
      "children": [
        {
          "_type": "span",
          "marks": [],
          "text": "This is a paragraph.\n\nThis is another paragraph.\n\nThis is yet another paragraph.",
          "_key": "29d0113c9888"
        }
      ],
      "_key": "92731c203548"
    }
  ]
},

Expected structure:

{
  "content": [
    {
      "_type": "block",
      "markDefs": [],
      "style": "normal",
      "children": [
        {
          "_type": "span",
          "marks": [],
          "text": "This is a paragraph.",
          "_key": "e4f2a496b9be"
        }
      ],
      "_key": "92731c203548"
    },
    {
      "_type": "block",
      "markDefs": [],
      "style": "normal",
      "children": [
        {
          "_type": "span",
          "marks": [],
          "text": "This is another paragraph.",
          "_key": "a00ddcc208bd0"
        }
      ],
      "_key": "469131fa9abf"
    },
    {
      "_type": "block",
      "markDefs": [],
      "style": "normal",
      "children": [
        {
          "_type": "span",
          "marks": [],
          "text": "This is yet another paragraph.",
          "_key": "7c0240d5fa0e0"
        }
      ],
      "_key": "ee655e6d00c1"
    }
  ]
}

Which versions of Sanity are you using?

@sanity/cli                 2.12.0 (up to date)
@sanity/base                2.12.0 (up to date)
@sanity/cli                 2.12.0 (up to date)
@sanity/color-input         2.11.0 (up to date)
@sanity/components           2.2.6 (up to date)
@sanity/core                2.12.0 (up to date)
@sanity/dashboard           2.10.5 (up to date)
@sanity/default-layout      2.12.0 (up to date)
@sanity/default-login       2.11.1 (up to date)
@sanity/desk-tool           2.12.1 (up to date)
@sanity/production-preview   2.2.6 (up to date)

What operating system are you using?

Ubuntu 20.04

Which versions of Node.js / npm are you running?