fix: add more lenient parsing for code blocks, to accept newlines #2105 (#2108)

Co-authored-by: Matthew Lipski <matthewlipski@gmail.com>

Author: nperez0111

packages/core/src/blocks/Code/block.ts

@@ -102,6 +102,7 @@ export const createCodeBlockSpec = createBlockSpec(
       const code = el.firstElementChild!;
 
       return parser.parse(code, {
+        preserveWhitespace: "full",
         topNode: schema.nodes["codeBlock"].create(),
       }).content;
     },

tests/src/unit/core/formatConversion/parse/__snapshots__/html/codeBlocksMultiLine.json

@@ -0,0 +1,19 @@
+[
+  {
+    "children": [],
+    "content": [
+      {
+        "styles": {},
+        "text": "console.log("First Line")
+console.log("Second Line")
+console.log("Third Line")",
+        "type": "text",
+      },
+    ],
+    "id": "1",
+    "props": {
+      "language": "text",
+    },
+    "type": "codeBlock",
+  },
+]

tests/src/unit/core/formatConversion/parse/parseTestInstances.ts

@@ -814,6 +814,15 @@ With Hard Break</p>
     },
     executeTest: testParseHTML,
   },
+  {
+    testCase: {
+      name: "codeBlocksMultiLine",
+      content: `<pre><code>console.log("First Line")
+console.log("Second Line")
+console.log("Third Line")</code></pre>`,
+    },
+    executeTest: testParseHTML,
+  },
   {
     testCase: {
       name: "basicBlockquote",