fix: Parse new lines in text/plain as line breaks (BLO-1170)

packages/core/src/api/parsers/markdown/markdownToHtml.ts

@@ -139,7 +139,7 @@ function trySoftBreak(
   i: number
 ): { html: string; end: number } | null {
   if (text[i] === "\n") {
-    return { html: "\n", end: i + 1 };
+    return { html: "<br>\n", end: i + 1 };
   }
   return null;
 }

tests/src/unit/core/formatConversion/parse/__snapshots__/markdown/blockquoteLazyContinuation.json

@@ -4,7 +4,9 @@
     "content": [
       {
         "styles": {},
-        "text": "This is a quote that continues here and here too",
+        "text": "This is a quote
+ that continues here
+ and here too",
         "type": "text",
       },
     ],

tests/src/unit/core/formatConversion/parse/__snapshots__/markdown/blockquoteMultiline.json

@@ -4,7 +4,9 @@
     "content": [
       {
         "styles": {},
-        "text": "Line one Line two Line three",
+        "text": "Line one
+ Line two
+ Line three",
         "type": "text",
       },
     ],

tests/src/unit/core/formatConversion/parse/__snapshots__/markdown/lineBreaks.json

@@ -0,0 +1,21 @@
+[
+  {
+    "children": [],
+    "content": [
+      {
+        "styles": {},
+        "text": "Line one
+ Line two
+ Line three",
+        "type": "text",
+      },
+    ],
+    "id": "1",
+    "props": {
+      "backgroundColor": "default",
+      "textAlignment": "left",
+      "textColor": "default",
+    },
+    "type": "paragraph",
+  },
+]

tests/src/unit/core/formatConversion/parse/__snapshots__/markdown/paragraphLeadingIndent.json

@@ -4,7 +4,8 @@
     "content": [
       {
         "styles": {},
-        "text": "aaa bbb",
+        "text": "aaa
+ bbb",
         "type": "text",
       },
     ],

tests/src/unit/core/formatConversion/parse/__snapshots__/markdown/singleNewLines.json

@@ -0,0 +1,22 @@
+[
+  {
+    "children": [],
+    "content": [
+      {
+        "styles": {},
+        "text": "Line 1
+ Line 2
+ Line 3
+ Line 4",
+        "type": "text",
+      },
+    ],
+    "id": "1",
+    "props": {
+      "backgroundColor": "default",
+      "textAlignment": "left",
+      "textColor": "default",
+    },
+    "type": "paragraph",
+  },
+]

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

@@ -1689,12 +1689,13 @@ Third paragraph`,
     },
     executeTest: testParseMarkdown,
   },
-  // Paragraph continuation (lines without blank line)
+  // Line breaks
   {
     testCase: {
-      name: "paragraphContinuation",
+      name: "lineBreaks",
       content: `Line one
-still same paragraph`,
+Line two
+Line three`,
     },
     executeTest: testParseMarkdown,
   },