software-mansion
diff --git a/‎src/web/__tests__/htmlNormalizer.test.ts‎
Lines changed: 28 additions & 0 deletions b/‎src/web/__tests__/htmlNormalizer.test.ts‎
Lines changed: 28 additions & 0 deletions
diff --git a/‎src/web/normalization/htmlNormalizer.ts‎
Lines changed: 21 additions & 3 deletions b/‎src/web/normalization/htmlNormalizer.ts‎
Lines changed: 21 additions & 3 deletions
@@ -497,4 +497,32 @@ describe('htmlNormalizer', () => {
       expect(normalizeHtml(input)).toBe(expected);
     });
   });
+
+  describe('InterBlockWhitespace', () => {
+    // Pretty-printed consecutive paragraphs must not gain empty <p>s from the
+    // newlines between them (those would later serialize as extra <br>s).
+    test.each([
+      [
+        '<p>Asdasd</p>\n<p>Asdasd</p>\n<p>Asdasda</p>',
+        '<p>Asdasd</p><p>Asdasd</p><p>Asdasda</p>',
+      ],
+      [
+        '<p>Asdasd</p>\n\n<p>Asdasd</p>\n\n<p>Asdasda</p>',
+        '<p>Asdasd</p><p>Asdasd</p><p>Asdasda</p>',
+      ],
+      [
+        '<html>\n<p>Asdasd</p>\n<p>Asdasd</p>\n<p>Asdasda</p>\n</html>',
+        '<p>Asdasd</p><p>Asdasd</p><p>Asdasda</p>',
+      ],
+      ['<p>Asdasd</p> <p>Asdasd</p>', '<p>Asdasd</p><p>Asdasd</p>'],
+      // Significant inline content between blocks is still wrapped in <p>.
+      ['<p>a</p> hello <p>b</p>', '<p>a</p><p> hello </p><p>b</p>'],
+      // Spaces inside text / between inlines must be preserved.
+      ['hello world', 'hello world'],
+      ['<p>hello world</p>', '<p>hello world</p>'],
+      ['<b>hello</b> <i>world</i>', '<b>hello</b> <i>world</i>'],
+    ])('%s → %s', (input, expected) => {
+      expect(normalizeHtml(input)).toBe(expected);
+    });
+  });
 });
@@ -323,11 +323,27 @@ function escapeText(s: string): string {
 
 // --- Blockquote content flattening ---
 
+function isWhitespaceOnly(value: string): boolean {
+  for (let i = 0; i < value.length; i++) {
+    const c = value.charCodeAt(i);
+    // space, tab, LF, CR, FF — mirrors GumboNormalizer.c
+    if (c !== 0x20 && c !== 0x09 && c !== 0x0a && c !== 0x0d && c !== 0x0c) {
+      return false;
+    }
+  }
+  return true;
+}
+
+/**
+ * Flush buffered inline content as a <p>. Inter-block whitespace (newlines /
+ * spaces between block tags in pretty-printed HTML) is discarded so it does
+ * not become empty paragraphs that later serialize as extra <br>s.
+ */
 function flushInlineP(ib: { buf: string }, out: { buf: string }): void {
-  if (ib.buf.length > 0) {
+  if (ib.buf.length > 0 && !isWhitespaceOnly(ib.buf)) {
     out.buf += `<p>${ib.buf}</p>`;
-    ib.buf = '';
   }
+  ib.buf = '';
 }
 
 function flattenBqChildren(
@@ -493,9 +509,11 @@ function walkChildren(node: Element, out: { buf: string }): void {
           break;
         }
         if (isElement(cur) && isBrNode(cur)) {
-          if (ib.buf.length > 0) {
+          // Whitespace-only buffer is layout noise; treat like empty → <br>
+          if (ib.buf.length > 0 && !isWhitespaceOnly(ib.buf)) {
             flushInlineP(ib, out);
           } else {
+            ib.buf = '';
             out.buf += '<br>';
           }
           i++;